(Anyone feel free to redo this.)
The two boys held Jeff's mouth wide open. Taller than him, Ryan lifted up a leg and stepped into Jeff's mouth. Jeff gagged a little, but found himself mostly unable to move or resist in any way. Something about being put out on the curb removed any compulsion for him to move somehow. All he could do was stand there, eyes watering from the soreness of having his jaw stretched out and the humiliation of being stripped naked. He could feel Ryan's foot pressing against the bottom of his stomach.
"Dude, move your foot around," Jason said curiously.
Ryan, struggling to balance, obeyed. He kicked his foot around, making Jeff flinch and whine in pain. Oddly, all of his movements were barely noticeable from the outside.
"Huh, can't even see it, " Jason marvelled.
"Of course not," Ryan spat back, "you never been dumpster diving in an inani?"
'Inani?' thought Jeff.
With that, Ryan heaved himself up, causing Jeff to groan as the lad's entire weight pushed against the bottom of his stomach, and put his other foot inside before sinking out of sight down Jeff's throat. Ryan's fingers, still holding Jeff's upper jaw, were the last thing to disappear.
Jason laughed at the sight and wrenched Jeff's mouth back open before leaping in after Ryan.
Jeff gulped. The two teens had scratched his throat up something serious.
He felt nervous.
Two people had just climbed inside his mouth and dropped into his stomach.
What if they got digested? Sure they were jerks to him but he couldn't have two deaths on his conscience. He could feel them moving around in his stomach. It felt really weird. Suddenly, a hand pressed against the roof of his mouth and pushed upwards. Jeff's head was forcefully tilted back and his mouth opened. Ryan's hand threw a ring out onto the sidewalk and slithered back down Jeff's throat. At least he knew they could get back out.
"Score!"
"Nice find, Ry," Jason congratulated his friend. He was too busy marvelling at his surroundings to do any scrounging.
"You're impressed by a dumpster?" Ryan sneered.
"I've never used, or even been inside, a living one before," Jason pointed out, "I didn't think it'd be the size of a whole dumpster inside. Thought they'd just be using Jeff like a household garbage can."
Jason wasn't being entirely accurate. Jeff's interior was a little smaller than a dumpster, but still a lot larger than your average garbage can. There was plenty of room for Jason and Ryan to sit in there, and probably room for a third person. There was about a week's worth of trash, and some gunk lining the rounded walls. There was a tight puckered opening near the floor, which presumably lead to Jeff's ass. It was tight enough that nothing fell through unless Jeff bent over and/or force was applied.
"Nah, that's the advantage to these things, they're way more space-efficient," Ryan explained, "I hear Genetilab can breed ones the size of a whole factory on the inside."
Ryan picked up a tampon, pulled a face, and threw it at Jason.
"Ew!"
"You should get them to engineer you into a tampon, closest you'll get to being laid," Ryan laughed.
Jeff could vaguely hear the gutteral conversation going on in his belly. If he could move he had a right mind to punch himself in the gut just to see what it'd do to them.
"Oi, garbageboy," A voice called out.
Jeff turned his head to see his brother marching over to him with two full garbage bags.
"I got supper for ya," his brother said before stomping on Jeff's foot. Jeff's mouth flew open and his brother crammed the bags down his throat. They stuck for a moment before he elbowed them in and they dropped into Jeff's stomach. There were two muffled "umpf!"s that were mistaken for Jeff's own voice, and Jeff's brother slammed his little bro's mouth shut again before walking off.
Jeff wanted to tell his brother what had happened but didn't get the chance. First because of the garbage bags being shoved down his throat, and second because his mouth seemed to be sealed shut from the heavy slam. By the time Jeff managed to force his own mouth open, his brother had long gone back inside.
Jeff started to get worried.
He felt legitimately full now. No matter how much bigger he was inside, he now felt completely full. Even his belly was bulging out a bit. He could feel Ryan and Jason squirming, pinned beneath the two garbage bags. Feeling a little guilty, Jeff tried to regurgitate them, but he couldn't bring himself to do it. He was genetically engineered to swallow trash and wait to be emptied, and that's what he did.
As the night went on, the squirming in Jeff's belly stopped, and Jeff himself starting to nod off, falling asleep standing at the curb. It wasn't until the morning that the loud sound of the garbage men approaching woke him up.