There was no real warning for either of them. Atalanta hadn’t even been aware of the staff that had pressed itself against the back of her head, let alone exactly who it was that suddenly hypnotized her and efficiently altered the most important parts of her mind with what could only be called a hack job that would not last against any actual effort to try and break or undo the process… But there would be no effort or time to try and fix her regardless, so did it really matter?
 
 
Jack walked the halls of Chaldea, upset about certain recent events and trying to make up some sort of plan of vengeance… Though, given who she was, her plans mostly just defaulted back to either murder and dismemberment or simple childish pranks with little to no variation or something between the two possibilities.
 
 
That was, at least, until Atalanta turned the corner and encountered the little Assassin, making Jack go through a few short self-checks, making sure she was going along with the various lessons that Atalanta had been doing her best to teach the “child” Heroic Spirits all across Chaldea with varied amounts of success. One way or another however, Atalanta was one of the truly motherly figures that got called as much by others as well, not just Jack with her continued tendencies to seek out a mother or call Master as such.
 
 
With such a relationship in mind, Jack found herself rather surprised when Atalanta suddenly just went down on her knees with a strange look on her eyes and an even stranger expression that she had not expected her to actually have. Before Jack could question it or even try to get away from the abnormal situation however, Atalanta was already holding her by the hips, by the small bit of clothing that Jack actually wore on her crotch.
 
 
“Wh-What are you doing?” Jack asked, in spite of the fact that they knew exactly what Atalanta was doing deep down. Given who Jack was, given who her targets were, the ingrained memories simply went so far that she fundamentally knew what was supposed to happen to the point that her body actually shifted appropriately to allow it to happen. “Wait, don’t–!?”
 
 
Of course, knowing and adapting did not properly mean that she truly wanted it to happen as she put her hands on Atalanta’s head and tried to stop her. In hypnotized determination however, the hands proved useless in their effort, Atalanta rubbing her face against Jack’s cock and balls for a few moments, causing her length to slowly harden while Jack herself shivered in restrained delight and moaned at the sudden stimulation.
 
 
Things progressed quickly from there, Jack’s limbs stiffening as well as her body simply seemed to refuse her desire to get away; it felt good, after all, so why should she go away? Especially in the mood that she had been in just now, why shouldn’t she try to enjoy herself a little. Maybe that was why Atalanta was doing this? To try and make her happy again? Maybe that did not really make much sense, but it was as close as Jack felt like she might be able to come to an actual answer.
 
 
While Jack was having the extremely short lived moment of questioning, Atalanta had not only managed to strip herself down until she was only wearing her panites, but get Jack’s cock just hard enough as well as take it in her mouth, starting to lick the starting few inches with a prehensile and skilled tongue, Jack’s cock only growing even harder, even larger, in response, gradually getting to its full length. It only lasted a few dozen seconds however before Atalanta pulled back, using one hand to caress Jack’s balls while her other one went up and down the length of the cock, stroking it, keeping it hard, spreading the wetness of her spit from base to tip.
 
 
She stopped after another short few moments however. “Enjoy your food~” Atalanta moaned out, much to Jack’s confusion, before sticking a finger down into the slit of the cock, making the Assassin twitch with her whole body, sucking in air to further voice the pain from the sudden insertion.
 
 
It did not stop there however, even if it got a lot less painful and a lot more pleasurable after the first instance. In short order, Atalanta inserted her next finger, then the next and the next and Jack swiftly found herself with a fist in her cock, grabbing handfuls of Atalanta’s hair to try and stabilize herself while she felt herself spread out where she definitely was not supposed to be getting spread out.
 
 
Jack watched with wide eyes as Atalanta continued to slide her arm in with the same lustful expression she had had from the start, putting her other hand on her forearm and sliding it in as well, filling Jack’s cock up even more. The inside of the cock was quite pleasurable to Atalanta’s current state of being, inviting her even further inside and making her feel like she could cum just from the feeling of the cock wrapped around her hands and arms.
 
 
When both arms were elbow deep, Atalanta further braced herself against the floor, lowering her head to rest between her arms and pushing herself deeper and deeper. Jack could only squirm, her own hands going to Atalanta’s body as they were unable to hold her by the head anymore while her back bent, her body twisting here and there in an almost serpentine way while her legs remained stiff, locked up from an overload of pleasure and sheer instinct that if she was to actually fall down or try to step away, she would lose it all.
 
 
With Jack effectively stuck in place like a deer in headlights, Atalanta had free reign to set her own pace and push herself further and further without any contest– Though in her current state, she just wanted to get it done as fast as possible, too eager to feed herself to the cock and balls, too eager to feel them wrapped all around her body to even consider taking it slow for either of their sakes.
 
 
In went her head, the same lewd tongue as before rolling itself out of Atalanta’s mouth and licking along the length of Jack’s cock again, this time from the inside rather than the outside, making it feel even better than it had before, the pleasure from it multiplying by an unknown but far more than sufficient number. Her cat ears only further proved to make it a better experience, as Jack was left feeling the soft fur of them further rubbing the insides of her cock and the small, attempted, twitches of the ears as Atalanta instinctively tried to get the feeling of precum that stuck on her ears off, though ultimately failing due to a lack of room.
 
 
Deeper and deeper Atalanta went, the cock head around her neck feeling like it could suffocate her for a few moments, only for it to end a bit too swiftly for either of them. While Atalanta found herself able to breathe properly again, were it not for the natural musk of her current surroundings, Jack found herself suffocating under the sheer volume and frequency of her own moans, the pleasurable pain truly starting to shortcircuit her mind bit by bit.
 
 
Every new body part of Atalanta’s forced the cock to spread even further, its length and general dimensions being meant for ‘standard’ sex, even if it was oversized to a doujin-like point. It was not meant to take in both of Atalanta’s arms and her head, the girth of both and either forcing it to accommodate far more space than they naturally should have been able to. Were she not a Heroic Spirit, giving her a far more adaptable and supernatural body, Jack was rather certain that she would have died or been split open in some way by now, but she was not, instead simply going through masochistic pleasure on a level she truly did not think possible, or that she even had this much of a masochistic side to her, really.
 
 
Were it not for the fact that Atalanta’s hands were already inside Jack, resting in her balls and trying to grasp onto something to properly keep pulling and pushing herself deeper inside regardless of the position and state of her feet, the shoulders would have been a particularly difficult challenge to overcome as well. In her current position however, they simply slid inside after the neck, a smooth transition even if it generally left a lot more in Jack’s cock all of a sudden.
 
 
Atalanta’s head managed to start entering the balls as well, spreading and outlining the genitals in general all the way down, her face bulging out on the ballsack in an obvious depiction of pleasure. Though she lacked breasts, being one of the flattest Heroic Spirits in Chaldea, Atalanta still found herself moaning out slightly more, her mouth open and available again now that she was in the slightly more spacious expanse of the balls, as her nipples were consumed by the slit.
 
 
Gradually, Atalanta started losing ground, slowing the rate at which she was able to push herself into the cock. The further inside she went, the more her weight lost against the hard cock, lifting her off the ground, away from a position where she was able to keep pushing herself inside. She adapted as best as she could, wiggling herself inside like a slithering snake, though as her hips came closer and closer to the cock slit, she needed to use the very tips of her toes to actually continue pushing herself in.
 
 
The actual moment in which she fully lost ground was also the same one in which the base of her tail was touched by the cock. She was not quite sure herself, as a result, if the sudden feeling of orgasmic bliss that washed over her was a result of strange stimulation to her tail, a simple buildup of pleasure or the feeling of truly reaching the point of no return. No matter what she could have tried at this point, unless someone else came along, there was truly no way for her to get out anymore and the feeling was exhilarating in ways she could not describe.
 
 
Jack “lost” almost at the same time as well. Unable to take the pleasure, feeling herself spread and almost tearing apart like this, her mind simply shut down several seconds before Atalanta reached her climax. All she could think about was the feeling of the cat girl sliding down and existing in her cock, the pleasure it brought truly breaking through any instance and thought of resistance or trying to stop it. She was left lustful and broken in short order and when it stopped, when Atalanta was unable to continue as she had been before, Jack’s legs simply gave out.
 
 
Maybe it was an instinctual response, something born from pleasure. Perhaps an observer, had there been any aside from the security cameras recording the whole thing and the hidden perpetrator behind the event, could make such an argument. The reality however was that Jack’s eyes had practically rolled to the back of her head while she was grasping desperately at the floor below her, unable to grab a fistful of the sheets below her as just about any other girl broken by pleasure would be doing right about now.
 
 
Jack was left on the ground with her hips bucking and back lifting off the ground in female orgasms that would have squirted over what was left of Atalanta’s body, were it not for the fact that Jack’s balls were absolutely enlarged, containing the upper half of her motherly figure and her pussy, still having been left over from her partial and instinctual transformation, was right below them, blocked by their mass. Even then, her continued string of orgasms, which she had been holding back in an attempt to retain some level of sanity and even respect for Atalanta, lubricated the floor under her, creating a small puddle as proof of the reality of the situation.
 
 
In such a position, Atalanta was able to get her feet, legs even, back on the ground, allowing herself to continue shoving, feeding, herself to the ravenous cock, not truly aware of Jack’s pleasure and simply pursuing her own with single minded devotion that simply would and could not be denied. The cock was still trying to lift her off the ground, but at the very least, she had found at least a precious few seconds, pushing her oddly sensitive tail even further, bringing her own needy pussy closer and closer to what was currently being treated as the ultimate embodiment of absolute pleasure.
 
 
Even when she was getting lifted off the ground again, Jack’s own horny movements helped get her deeper inside, her position further allowing gravity to help along, even if slowly. The moment that Atalanta’s clit met Jack’s cock was, as a result, short lived but made Atalanta feel heights of pleasure that may have been denied even to the Gods themselves; naturally, it was not a single moment either.
 
 
Atalanta wanted to simply freeze, to stop moving her own body deeper inside and enjoy the feeling of her clit being dragged and thus pleasured by the cock meat that completely engulfed it, but that was utterly impossible. She moaned loud enough to be heard even through the thin “walls” of Jack’s balls while shifting her body wildly, almost trying to truly roll around inside the cock with her legs flailing wildly in a lustful frenzy of trying to get as much pleasure as she could from the experience.
 
 
As a result, before she knew it, it was over, her pussy crossing the threshold between Jack’s cock and balls, joining the rest of her body inside what would be her final resting place. She had drained herself rather thoroughly in the process, leaving her with almost no energy to even keep going further inside, barely able to breathe. For the past unknown amount of time, all she had been able to breathe was the musky and generally cum scented air that was inexplicably inside the Assassin’s balls, allowing her to actually keep going in a conscious way. Perhaps there never was any air in the first place and all she had been experiencing was the bodily scents with none of what could keep her alive, but that was another needless mystery one way or another; all she knew was that almost every part of her body had been infused with the smell and feeling, which itself felt like it caressed her body in a certain way.
 
 
Atalanta wanted to keep going, but her breaths were getting shorter and shorter, her strength used up and her general surroundings starting to very slowly wear her down. Jack definitely wanted her to keep going as well, but she felt the Archer simply stop just as her cock was consuming the girl’s thighs. Jack’s strength faded away as well, though ultimately for a different reason as she was simply left feeling drained and like her body was made of some strange sort of jelly that would no longer properly obey her commands.
 
 
There was nothing left for either of them to do but let it slowly end. Jack’s cock had seemingly taken a mind of its own, slowly consuming Atalanta’s legs with gravity’s help, twitching time and time again to finish off the Archer, taking her thighs inside, then knees and working down her calves at a snail’s pace compared to the frantic pace they had been going at before. Even then, both sides simply enjoyed the afterglow of the heights of pleasure they had managed to reach.
 
 
Before long, Jack’s cock managed to close itself again, Atalanta’s toes vanishing down inside it, simply leaving a painfully hard dick pointing at the air and a massively oversized scrotum under it, which shifted every now and then as Atalanta tried to get herself into a slightly better or generally more comfortable position.
 
 
There was no promise of escape, or real chance of survival, but there was also no need to struggle, for she had “willingly” fed herself to the cock. In fact, exhausted and blissful as she was, Atalanta found herself dozing off, comforted by the warmth of Jack’s insides. Jack, meanwhile, was unable to really find the strength to move from her current position, trying to get her breathing back in order as she felt far too awake to even consider dozing off.
 
 
As the seconds started to turn into minutes, Jack’s legs started working on their own, rubbing her thighs against the massively oversized sack containing Atalanta, bringing herself some level of pleasure again as she massaged herself absentmindedly, moaning softly in the process. She could feel Atalanta slowly getting softer as well, feel the parts where she was not quite as hard.
 
 
Though she was not really sure if she could really speed up the rate at which Atalanta would break down, Jack still continued to rub herself, slowly adding her hands into the process, kneading her balls, pressing down into and against Atalanta’s upside-down body, trying to prompt her to vanish faster.
 
 
Of course, pleasuring herself was not without consequence, Jack’s hips working again as she came, now from her cock as it was no longer plugged up. Her cock was still hard enough to point at the ceiling, her orgasm powerful enough to shoot out her cum hard enough that it reached the apex of its flight just short of sticking to the surface above– Only to fall back down on Jack.
 
 
By some instance of luck, or perhaps the lack thereof, Jack found her torso slightly blanked by the cum that Atalanta was gradually getting turned into, while Atalanta’s panties fell right on her face with a wet “Splat”. Even so, she did not do anything about either instance, even if her nose hurt a little now from the falling underwear, instead still trying to get herself into a state where she could actually move…