"So, what do you want to do?" Kyle's fingers stroked Jeff's head as he talked. "We can try playing 'spy' again and see if anyone notices, although Mom kinda freaked out last time. You shouldn't have talked. Or I-"
"Wait, spy? How do we play that?" Jeff asked. He wasn't sure about his younger brother's sudden grin, the way he stood up, or the way he started unbuttoning his tight jeans.
"You don't remember? Well, you loved it last time, although it was kinda accidental."
As he talked, Kyle's fingers slipped into the waistband of his briefs and pulled them
down, exposing his growing erection. Jeff couldn't help looking down, which made Kyle's lips touching his shaft-body a complete surprise. Darkness surrounded him as Kyle took Jeff's head into his mouth and gave him a quick, strong suck before pulling him back out. He was barely aware that his own body was engorging, before Kyle pressed Jeff's damp head firmly against his own dick. Jeff watched the room deform for a moment, before he felt a distinct popping sensation and everything went back to normal. He felt Kyle squeezing himself and Jeff together all the way down his shaft, then an uncomfortable amount of pressure around his balls as Kyle squeezed almost to the point of pain, and then it was over.
Somewhere above him, Kyle let out a breath and then, with a sensation like a rollercoaster going down a sharp hill, Jeff felt himself drop. The massive valley of Kyle's thighs rose up around him, and Jeff found himself staring straight into Kyle's crimson briefs.
"Fuck. Forgot how good that felt." Kyle's fingers pulled the foreskin away from the glans that made up Jeff's face, and then let it slip back. He sighed and stood, and Jeff moaned softly as his face stretched his foreskin open all the way, and he throbbed as a full erection. Kyle waddled over to the full-length mirror in the corner, and Jeff saw that he looked like nothing more than Kyle's own, fat cock. Curiously, he tried to move his balls, since they'd worked as his feet before, and was satisfied to see Kyle's nuts move, seemingly on their own. If anything, the sight only made him harder.
"So, whadd'ya say, big little bro? Up for playing spy?"
"Sure! But why-?" Jeff broke off as his brother shuddered and gasped with surprised pleasure. "Oh. That's how Mom caught us?"
"Kinda. " Kyle drew a shuddering breath, and let it out slowly. "That and the voice coming from my crotch. The only other way anyone would know is when they start wondering how my foreskin grew back." Kyle's fingers traced along the side of Jeff's shaft. "I've been wondering what it'd feel like using you for sex with Alissa, but she'd ask too many questions."
"I'm up for that, but-" something flashed red in the corner of Jeff's vision, and he realised it was something on the chronivac monitor. "Hey, what's that? Something on the computer?" The words were out before Jeff knew it, and he mentally kicked himself.
"Oh, hey. When did that start working?" Jeff's vision went crimson as Kyle's briefs swallowed him, then gradually darker as Kyle buttoned up his jeans. Every step his brother took made the tight fabric rub against Jeff in interesting ways, and then tightened more as Kyle st down with a creak from the rickety old computer chair. A mouse clicked twice. "Says 'program error' something about a sixty minute time limit being reset to sixty days? Oh, there it goes." A few more clicks from the mouse followed. "Turned itself off again. Piece of crap."
Jeff felt Kyle stand, then something huge fumbled next to him. A few movements from Kyle, and the sound of a phone camera later, and suddenly Kyle was unbuttoning his jeans again. Jeff found himself flopped nearly onto Kyle's phone, where a picture of his slim, muscular brother posed, fists on hips, grin on his face and the subtle outline of a mammoth erection in the front of his tight, blue jeans.
"Whaddya think, bro? We're both in it, so I think it'll go on my home screen."