"Welcome home!" Chika immediately sat her enormous boobs on Ichi's head. "You're as small as ever!" she remarked cheerfully, and it was true. His stature was like that of a grade-schooler, and his build was slight as well. If it weren't for the hints of stubble on his face, one could easily mistake Ichi for someone much younger than he was. "I guess you've been naughty, huh?"
 
His nonplussed expression, buried under Chika's extensive mammaries, was unfortunately for him less visible than the protrusion in his pants. "It's your fault," he muttered into her chest as he extricated himself from Chika's grip. "Besides that, what are you doing in my house?"
 
"I heard you'd be home alone for the long weekend and thought you might be lonely, so I came by for a visit! I'm so glad you're happy to see me, too!" she said while grasping the protrusion in his pants. Ichi wasn't even sure if she was talking to him or just his dick. "Hold on, lemme snap this to Emiri, she'll be so amused!"
 
"Leave my crotch out of the selfie," Ichi complained, but spun around as Chika requested so she could rest her boobs on his head again, this time in front of the camera. With a "teehee" expression on her face (and his usual bored look on Ichi's), the picture made its way across the net to her bestie.
 
The reply from Emiri was almost instant. "OMG, he's so small! Wasn't he taller before?"
 
"Yeah he was," she video'd back quickly. Ichi stayed put obediently and enjoyed the feeling of the soft mounds spilling over almost to his ears. "But evidently he's been naughty lately!"
 
Emiri laughed in her reply. "How does that affect his height?"
 
"It's my... disability," Ichi chimed in. "My body doesn't make... semen... properly. So every time I cum, my body gives up a little of my body weight to replenish it." He was kind of turning red, but he'd at least chatted with Emiri online a few times so he was more comfortable talking to her than most people. "Depending on how much it happens, it can stunt my growth or worse."
 
"OMG that's so weird. So you mean if you have lots of sex you'll get even smaller?"
 
"Yep, so if he's shorter than before, it means somebody's been masturbating!" Chika seemed unnecessarily amused at this. "And he says it's my fault!" She was raising her eyebrows so dramatically it caused her chest to jiggle. Her breasts were starting to slide apart, so Ichi's head was pressed almost into the underside of her cleavage through her t-shirt.
 
"Hot damn, you two, get cooking while the going's good! Oh, but then you might end up REALLY small, huh? Look out, little guy, Chika's a horny nympho!"
 
"Thanks," Ichi said, not totally sure what he was thanking her for.
 
They left it at that, promising to send Emiri any juicy updates.
 
"By the way, I made some dinner with the stuff you had on hand, but before I finish it and serve..." she looked suggestively at the hand where she was still grabbing his crotch.
 
"Alright, alright," Ichi accepted. "Lead the way."
 
She did, quite literally dragging him to the bedroom, where she stripped off her top and his in quick succession. Now that she'd finally released his crotch, Ichi dropped his pants, then playfully shoved her onto her back on the bed behind her, tugging Chika's tights and undies off as he did. Ichi situated himself between her spread legs, and without any further foreplay, thrust a cock that was not at all proportionate to his diminutive frame into her waiting pussy. Chika moaned with pleasure and bucked her hips. They went wild for just a couple minutes before it was over, Ichi spewing his load inside her.
 
"Mmm, not a bad start. But I'm gonna want more after dinner, little guy," she said, stroking a hand down his lean, sleek chest.
 
"Sure. I should be careful, but one or two after dubber today won't hurt. But first, let's eat."
 
As they stood, Chika compared heights by resting her boobs on his head yet again. "Hmm... feels like I get less support than before. Do you think you lost a whole centimeter already?"
 
Ichi just shrugged. "I'll grow it back eventually. Probably."
 
Dinner was tasty, but Ichi was distracted partway through by the skilled handjob Chika gave him, and "one or two after dinner" became one break during cleanup and another one doggy-style when the dishes were done. By the time they settled down to watch a movie, he'd lost so much height that Chika couldn't rest her boobs on him at all when she was standing; her navel was at about his eye level. In fact, with her sitting on the couch, he was at just the right height to lean in and kiss her on the lips, a fact which Chika couldn't resist snapping to Emiri.
 
"Holy shit, you two have been busy!" Emiri replied after a bit. "How small can you go, boytoy?"
 
"Never really tried to find out," Ichi replied matter-of-factly. "Haven't been smaller than this since I was a kid though."
 
"We'll have to keep testing," Chika said with just a hint of deviousness in her tone, which Ichi chose to ignore.
 
They snuggled up and watched the movie together, Ichi eventually migrating to Chika's lap before they tilted over and dozed off that way, Ichi using Chika's right breast as a (very comfortable) pillow. A few hours into the night, Chika's stirring woke him up.
 
"Mm, we should probably switch to the actual bed at some point..."
 
"Doesn't matter to me," he said, snuggling deeper into her exposed cleavage.
 
"Mmm, you look pretty cozy," she observed. "I bet I could practically sandwich my boobs around your whole body," she mused sleepily.
 
"No way," he said. "I'm not that small yet."
 
"No, seriously, watch," she said, taking the challenge and pushing her boobs out with either hand to stretch them forward around where Ichi was nestled. She had to slip her top off to do it, but she managed to wrap them around to the point where the nipples of each side just barely brushed against each other in front of Ichi's nose. "Haha! See, don't underestimate my boob power!"
 
"Uh, Chika?" Ichi said nervously through a wall of titflesh. "Don't move?"
 
"Why n-... oh, I see," she realized, recognizing a telltale stiffness touch the underside of one boob. "Being a tit sandwich got you turned on again, didn't it?"
 
"Look, I should really-" he started, but couldn't complete the thought as she rubbed the inside of her cleavage on either side of his face and shoulders. He squirmed, but Chika could tell his movements were more about enjoying it than escaping.
 
"Tit sandwich, tit sandwich, horny little tit sandwich," Chika teased, and was rewarded with a pearly splat on the underside of one boob.
 
Ichi looked at her sheepishly as she grabbed a tissue to wipe herself and him off.
 
"You'd do that again, wouldn't you?" she said, grinning.
 
"Maybe later."
 
"Good, 'cause now I'm turned on and I want a serious fuck." She turned him over and bowled him onto his back with her boobs, each of which felt almost as big as his ribcage at this point.
 
"Oh no," he said.
 
"That's not what little Ichi is saying," Chika said as she guided his member back to her greedy slit. Sure enough, he was already rising to attention again. Straddling him on the couch, she rode him hard until at last her pussy convulsed in orgasm. For good measure, she thrust up and down a couple more times, until she felt him finish, too.
 
"No more," Ichi said, clearly exhausted, and Chika giggled.
 
"Alright, alright," she said, helping him up off the couch. She took stock of their relative heights: he was probably half as tall as he'd been when he came home, and skinny enough to match. "C'mon, let's go to bed," she said, and lifted him (easily) over her shoulder. Quite pleased with herself, she carried him to the bedroom.
 
The first snap Emiri got the next morning was titled "new magic trick." (It was taken after they'd already been at it for a couple rounds, morning wood being as good an excuse as any.) The video, which she immediately saved for her personal reuse, showed Chika holding up her big, round, bare breasts, gently pulling them apart to reveal her boyfriend wedged between, then pressing them back together until his presence was completely indistinguishable.
 
"I want a full-body titfuck, too!" she replied back, perhaps unwisely honest, but Chika just replied with numerous laughing emojis.
 
Ichi, for his part, had crossed a line from, "This could get bad," to, "Well, I'm already too small, so why hold back?" and was gleefully exploring the ways his new stature could interact with Chika's body, especially her boobs. He particularly enjoyed having her rest them on the bed in front of him, then throwing himself into them like giant padded cushions. Chika found it adorable, and encouraged him to climb over her body, occasionally smashing him into her boobs just to see his reaction.
 
When they compared height again, the very top of Ichi's head reached about halfway to her knee, making him decidedly less than 30 centimeters tall. The only downside was that his penis, still kind of big for his size, was no longer quite enough to stimulate her. (A few seconds into trying, she gave up and slid him up her chest to slather him with a big kiss, which was enough to trigger his orgasm (and also leave saliva all over his face). "Sorry, hotness, I guess it's not gonna work right now, but I'm still having a lot of fun anyway. We can do it again later when you grow back. Love you!" She rubbed herself off with one hand while squeezing him against one nipple with the other. In doing so, she discovered that this felt pretty good, and he seemed to enjoy thrusting against her nipple, so she transferred him to the other side and went for another one.
 
"I still can't believe you two," came another snap from Emiri as they took a breather afterward. "Is Ichi gonna be OK?"
 
"Happy as can be!" Chika sent back, holding Ichi in one hand next to her face in the selfie, preserving his modesty with the fingers wrapped around his waist.
 
"OMG he's so tiny! That was super fast! You could practically swallow him whole at that size!"
 
"Like this?" Chika pantomimed, turning to a profile shot and lowering Ichi towards, then past her open mouth, on the opposite side of her face from the camera. She then gulped theatrically.
 
Emiri wasn't fooled, but she saved the video anyway.
 
"Would you like that?" she teased Ichi afterwards, "Graduating from fuckboy to entree?"
 
"Hell no!" he said. "... but I would totally let you deepthroat me if you promised to be careful."
 
"Ha! You're probably still too big for that... Don't wanna choke on my boyfriend, after all... But that does give me an idea..."
 
Ichi raised an eyebrow.
 
"Point your toes out and hold your knees stiff," she instructed. As she shifted her grip on him, suddenly Ichi had an inkling what Chika had in mind, which was confirmed as she shifted and spread her legs apart. He craned his neck to see the glistening folds she pointed his toes into.
 
"Mmm, yeah," she moaned as she rubbed his feet against her clit, then around her outer lips, looking for a spot just under the hood to put pressure on. "Oooh, yeah, right there..." Ichi wiggled his feet around to stimulate her more, which seemed to be working as the musk of her opening washed over him. "Now, over here," she mumbled to herself, edging his feet toward the opening into her passage, then guiding them in. "Ahh, yeah..." she cooed, working him in up to his knees as he felt his ankles surrounded by the slippery membranes of her insides. "Little more..." Chika had to adjust her grip to guide him past his thighs into her opening. The sensations were too much, and the instant her flesh washed over his dick, Ichi came again.
 
"Dammit, now I need more," she commented as his further loss of stature tickled not quite the right place inside her. She let go entirely, letting herself feel the extent to which Ichi was buried in her pussy as she clenched and unclenched her muscles, then lowered her hand down where he could grab hold of her finger and thumb. Ichi latched on hard, but to her surprise, used the leverage to thrust himself a little further in, then back out, stimulating her more. Chika sighed with pleasure and went along with it, guiding him back and forth, gradually pushing deeper and deeper.
 
"This feels amazing..." she mumbled, losing track of herself as she rubbed his shrinking body deeper and deeper. When she finally reached orgasm, she instinctively let go and rolled onto her back to catch her breath, without really thinking about the fact that Ichi was fully inside her.
 
When it did occur to her, the first thing that came to mind was to grab her phone to send another snap to Emiri. She normally wasn't this raunchy with her bestie, but she was still too excited to second-guess herself much. She pointed the camera toward her crotch and spread herself apart. "Guess where boytoy is," she bragged, fishing in to pull him out... if only she could get ahold of him...
 
"Uh oh..." she said.
 
Emiri saved that one too.