Green Hill... One of the most peaceful places for you to spend time in. There was a dozen things you could do in here... Including running at the speed of sound. And that's exactly what a certain blue hedgehog was doing.
 After coming back from foiling Eggman's lastest evil scheme, Sonic decided to do some running in Green Hill. Now that there's no imminent danger threatening to dunk the world in chaos or something, he could enjoy what to him was a leisure stroll through his second favorite place to be, the first being a chilli dog stand.
 Running is second nature for Sonic. He lived for the thrill that came with speeding. So much so that he developed a kind of sixth sense that helped him easily avoid usual obstacles, like a stone on the path, a flamethrower at waist level, death missiles raining from the sky, the odd energy ball here and there... Common stuff.
 A pair of pink, massive, wobbly buttcheeks is not a usual obstacle.
 Coming around a bend in the path, he was met with the rear of none other than Amy Rose, who was distractedly picking flowers, and most likely thinking about him. In this particular day, she seemed to have foregone any undergarments, leaving her big bubble butt completely bare in all of its glory for the world to see whenever she bent over.
 And it was in that exact same position that Sonic, unable to slow down in time, plowed right into. There was a yelp, a moment of confusion where the world seemed to tilt on its axis, then his back slammed onto the ground and a heavy weight deposited itself onto his face, shrouding the world in darkness.
 Now say what you will about Sonic, but he is no virgin loser, thus he knew exactly the position he was in. A certain two tailed fox liked to "experiment", and being the kind of hedgehog that can play on both fronts, Sonic was more than eager to help. It may come as a surprise to most people, but that was the kind of relationship that one develops after going on adventures together for so long.
 Nonetheless, Amy's rear end was NOT one he wanted to touch, she just doesn't make his type. She was attractive yes, but her personality kind of put him off on trying to pursue anything serious with the pink hedgehog other than being friends.
 And so, he started desperately struggling, trying to get a good grip on those massive cheeks to try and push her off himself. The problem is, she was slick with sweat, and his hands kept slipping. He started panicking a little...
 "Ooooh Sonic my love, I didn't know you could be so forward~"
 And then he started panicking A LOT.
 He tried to formulat a response, but between the huge ass cheeks engulfing his head, and him trying to keep the sweat on said cheeks from dripping into his mouth, all that Amy heard were muffled sounds. Which somehow on her head, translated to him complimenting her wide rear.
 "Aww thanks! I knew you would come around and see my beauty!"
 A frantic tune seemed to start playing on Sonic's ears as he realized he was running out of air. He started struggling frantically, he didn't want to be remembered as the guy who died to Amy's butt, that would forever ruin his image. He tried grabbing, pushing ans even squeezing, but all this seemed to be doing was pleasure the pink hedgehog.
 "Ooooh Sonic, you're so good with your hands~"
 This was it. He was gonna die of suffocation from a butt, and it wasn't even a butt he wanted in the first place. When it seemed he was going to lose consciousness, the weight started rising from his face finally: Amy seemed to be standing up. He sucked in a huge, relieved breath and immediately shot up.
 And that... Was a mistake.
 In his eagerness to get away from the pink cheeks of doom, he tried to stand up as fast as he could. What he forgot at that moment however, is that he is already faster than any other normal creature, and thus, "as fast as he can" for him is way faster than basically anything. This wouldn't be a problem is he was standing up by himself. Unfortunately, he wasn't by himself. A certain pink hedgehog was still not off him completely.
 He realized his mistake a moment too late.
 And so, he plowed right into Amy's rear at supersonic speeds once more. But this time, the momentum was more localized, and instead of the impact he was waiting for, he instead slid smoothly between the butt cheeks, all the way up until for a brief moment, he was staring at a small, puckered hole.
 And then the momentum caught up to him, causing him to fly forward, right into said hole.
 Amy was in the process of standing up when she felt something press into her ass for a split second. And then said something stretched her rear wide open as it slid right inside without stopping with a loud SCLORP, before all momentum transferred to her and she was sent rolling forward a small distance, coming to a stop on her back, her entire body shocked from pleasure and unable to move.
 Sonic himself had frozen up, his eyes darting around the darkness of where he was. He didn't want to believe it, but how could he deny?
 He was right in Amy's stomach.
    ~Alpha~
 Grunting and wiggling around, Sonic tried searching around for the exit. He's escaped numerous deathtraps already, courtesy of a certain mad doctor. Granted, none came quite close to being as weird as this position he's currently found himself in. He valiantly tried to ignore the fact this is actually happening, but that was quite hard considering the gurgling noises that were coming from around him.
 He paused. Gurgling?
 It was at that moment that Sonic felt the mild stinging sensation on his body. It didn't take a genius to figure out what was happening, and that realization made his panic skyrocket.
 He was being digested!
 Redoubling his efforts, Sonic struggled, pushed, stretched, did everything he could to try and escape this situation. However, confined in such an awkward position as he was, it was quite hard to do anything.
 "Amy! Amy, let me out of here!" He yelled, hoping the pink hedgehog could do something about the situation, but didn't get any answer. "Amy!! I'm serious!" He tried again, but still didn't hear any response. Why wasn't Amy doing anything about this?
 The answer to that question came in the form of a faint mumble followed by a moan. He finally realized why Amy wasn't answering him or doing anything to let him out...
 She must have passed out from shock and pleasure!
 A sudden compression on his fleshy prison was all the warning Sonic had before the stinging sensation increased tenfold. It felt like his entire body was target practice for a thousand bees, which was only made worse by the fact he couldn't move anymore.
 Slowly, he lost feeling in his body as Amy's stomach worked away on the unusual meal it received without warning. The last thought in his mind before everything faded to black was:
 "I hope nobody finds out about this..."
 ...
 ...
 ...
 Sonic woke up with a start. He sat up on his bed, covered in cold sweat as he looked around in the darkness of the room he was in.
 Was that all a dream?
 He looked up as a knock sounded from the door before Amy herself pushed it open, wearing some comfortable sleeping clothes as she rubbed her eyes. Seems she had just woken up too.
 He was about to panic and question if she had invaded his house before memories of the day prior finally came to his tired mind, reminding him that this was neither his room, nor his house for that matter.
 Amy had invited him and his friends over to spend the night on her house so they could all go together see the new amusement park that had settled next to Emerald Town. Tails and Knuckles were both told to bring sleeping bags and stay in the living room while Sonic himself would have the guest room for obvious reasons. And the girl wouldn't take no for an answer, so for the sake of avoiding unnecessary physical trauma, they had all agreed.
 "Is everything okay, Sonic?" Amy asked with a yawn. "I had the faint impression that you called my name..."
 Shaking his head, Sonic took a deep breath to calm down before offering a thumbs up to her. "Just a weird dream, don't worry about it." He reassured.
 "Okay, but if you need anything, don't be shy about asking me~" She giggled, winking at him before turning to go back to her own room.
 Sonic sighed in relief. Of course none of that dream was real, he felt almost silly that his mind would conjure something so ridiculous as a nightmare.
 However as he watched Amy walk away, he couldn't help but notice her already enormous cheeks wobbled with added weight...
    ~Beta~
  How was that even possible? This challenged everything he knew about how the body works. Then again, he isn't quite sure how Amy's body works exactly. The years she spent chasing him should make her one of the most athletic girls he's ever known, and yet...
 Wait no, focus! He needs to get out!
 "Amy! Amy, can you hear me!?"
 "Oooh Sonic, you naughty hedgehog~ I knew you just couldn't express your true feelings for me~"
 What.
 "If you liked my butt so much, you could have just told me silly! There was no need to dive into it~"
 **What!?**
 "Stop screwing around! How the hell did you even manage to fit me in here!?" He yelled in confusion and a bit of concern.
 "According to Rouge I am a 'size queen', whatever that's supposed to mean. None of that matters right now though, you finally declared yourself to me- although in a very unusual way- and I couldn't be happier!" Amy squealed, doing her best to hug her distended belly.
 That had the inadvert effect of squishing Sonic's already confined space, which wasn't something he needed right now. He pushed back with all his might, struggling for a moment until Amy released her gut with a groan of pain.
 "Can you be a bit more gentle please, Sonic? That's giving me a bit of a indigestion..." Amy complained, rubbing her belly.
 Sonic's eye twitched for a moment, but he took a moment to calm down. Getting angry at Amy won't help him escape his current predicament and he knew that, but it was so hard to think properly whenever he was around the pink hedgehog, so imagine how much harder it might be with her *literally* being around him. He would have laughed at his little internal joke if it wasn't for the current situation.
 "Listen Amy... Can you let me out of here? You got it all wrong." He tried explaining.
 "What do you mean?" She questioned. He needed to choose his next words carefully, considering how volatile the pink hedgehog is, he wasn't sure exactly how she might react.
 "Well..." He began as tactfully as possible. "I don't... Really like you that way. I'm sorry, this was just an accident, I didn't mean to even touch you... I didn't even think this would happen, so if you could please let me out..."
 Silence was all he could hear for a few long moments. These moments stretched into a full minute, then into two. At this point he was starting to get worried Amy might have fainted or something.
 "...What do you mean?" She eventually asked. Sonic sighed, having expected something like that.
 "Amy, I don't see you as a romantic partner. I just... Don't feel like the two of us can work. I can only like you as a friend, nothing more. Now if you could please let me out-"
 "I don't understand!" She cut him off. "I dedicated my entire life to being with you! I have followed and helped you since the day we met!" She exclaimed.
 "While it's true that you have helped, and even saved me multiple times from bad situations - and don't get me wrong, I'm thankful for those times - I just find you obsession with me a little bit... Unnerving. Also seriously, let me out please, it's starting to sting a bit in here..." He idly rubbed at his arm, trying to ignore the sensation.
 He waited for a response, feeling reassured that he would be let out and the two would look back at this situation and laugh at how absurd it was. He was confident that now that he explained everything to Amy, she could tone back her tendencies, maybe even find someone who would actually like to be involved romantically with her.
 "...No."
 His thoughts ground to a stop at the answer.
 "No? What do you mean no? C'mon Amy, stop screwing around and let me out..."
 "No!" She answered more forcefully. "All of these years, I did my best to show you how much I love you! We were supposed to be the perfect couple, to have a beautiful marriage, move in together and be happy!"
 Sonic could almost hear the tears sliding down her face and tried to salvage the situation. "Look Amy, I just-"
 "You just broke my heart, is what you did!" She yelled, cutting him off. "Being with you was the only thing I ever wanted! Even when you ran off to help some other woman, I tried to not give in to my jealousy, because I knew it would make you feel uncomfortable! But you know what!? Fine! If I can't have you, then I'll just make sure nobody else can!"
 "What are you talking about? Let me out!" He yelled, pushing against the stomach walls holding him, but for some reason now he couldn't push as far as he could a few minutes ago. In fact, he could almost swear the walls were pushing back. And the stinging sensation he was feeling earlier also came back with a vengeance.
 It took him a split second to realize what was happening: he was being digested! He started frantically struggling while calling out. "Amy, this isn't funny! Get me out of here right now!"
 But the pink hedgehog was no longer listening. She just sat against a rock, crying her eyes out at being rejected by him. Meanwhile, Sonic paused for a moment, wondering why his limbs were starting to feel heavy, only to realize with horror that they were melting away. He yelled and struggled even harder, but all was for naught.
 As the rest of him melted down into mush, he could only regret, for the first time, going too fast.
 Amy let out a sad sigh, feeling the last of Sonic's struggles fade away. She idly rubbed her gurgling gut as her powerful metabolism processed the mush, turning what was once a hedgehog into just more fat on her curves. She lamented having to do this, but he didn't give her any choice. It would simply hurt too much seeing him with someone else after this.
 She stood up, blushing slightly as her ass cheeks wobbled with the added weight of a whole hedgehog, and was about to head home when she heard something.
 "Ugh, what happened...? Why do I feel so weird, and why can't I move my body...?"
 That... That was Sonic's voice! But how, she was sure that he...
 Amy paused, glancing down at her rear. "Sonic...?" She asked, squeezing one of her buns with a hand.
 "Wha- Hey! Who's squeezing me, where am I!?" Came the voice again. There was no denying it now. Sonic was literally the fat on her ass.
 Amy started smiling. Then she giggled. Then she pretty much squealed before groping her ass with both hands, rubbing and squishing it, much to the prrotests of the ex-hedgehog
It wasn't the result she was expecting, but it was so, so much better.
 "Oh Sonic, this is great! Now we can be together forever and ever!" She exclaimed in happiness.
 "What are you talking about?" Was the confused reply.
 Amy just giggled again and start towards her home with a spring in her step, which sent her cheeks jiggling and wobbling all the way. She just had so many ideas she wanted to try, and not a moment to lose. She was ecstatic, perhaps for the first time, about Sonic having gone too fast.