Jay took a few minutes to catch his breath after such an intense work-out. He grabbed the chronivac and thought about how much he had enjoyed the wild experience... He realized that he secretly wanted more and he also realized that with the chronivac no one had to know anything that he didn't want them to know.
He increased Sean's height a bit more, pushing it past six foot, and increased Sean's bulk and increased Sean's pussy size. Sean would look like an award winning male body builder with a pussy... Then he upped Sean's estrus periods to act closer to an animalistic heat or need. Sean's would want him to get pregnant at the next available chance and if Sean doesn't manage a strict birth control regimen he might end up as continually running stage musical version of the movie Junior.
That's when Jay started to feel really creative. He lengthened and expanded his cock size and increased his stamina. He gave his balls a quicker "recharge time" and himself nearly multiple orgasms. He knocked his own height down a few inches from 5'10 to 5'7, making himself a bit short for a guy, but nothing that people would really notice. He softened and shrunk his waist just enough that you might notice it with his shirt off, but otherwise he looked normal. He softened his legs and removed his leg hair, then lengthened his legs just enough that if he wore shorts he'd have quite a pair of curly, girlish legs, but wouldn't be noticeable in a pair of pants, particularly because people might be too busy watching his third leg. He increased his nipple sensitivity and size, deciding that girlish nipples would also be easy enough to hide under the thick polo shirts he wore to work (not yet taking into account how itchy those shirts would be on his more sensitive nipples). To further protect his masculine reputation he gave himself a stronger jawline, bigger adam's apple, and bushier goatee and darker stubble around it, deepening his voice a bit more while he was at it. He figured that would be enough to confuse anyone who might find the new him girlish...
He looked over the final whole in the mirror, nude, for a few minutes. Jay was very masculine from the shoulders up and a large dick, but the rest of him more resembled a tall-for-her-age, small-breasted pre-pubescent girl with amazing legs that seemed to border near the land of being sexily curvy stilts. But Jay felt safe in that he didn't think that anyone had to know except his roommates. Jay found the sight oddly interesting and a quick nipple rub lead immediately to a large erection. He hid the Chronivac in the bathroom and came out wearing nothing but a huge smile and that large erection...
Sean was either impressed or in estrus because Jay had taken only a few steps before Sean passionately pounced on him. Sean tackled Jay to the carpet with a wild kiss, and Sean's ass and knees brought Sean's pussy lips to touching Jay's cock like a homing missile or a magnet. Sean used amazing pelvic precision to gently rub his pussy's lips down Jay's cock, slowly coating it with his feminine cum, while Sean's hands work themselves down to play with Jay's girly nipples. Sean broke the kiss only for brief girlish moans. If Jay wasn't so wrapped up in the moment of the thing he might have wondered if he had given Sean that girlish pitch with the chronivac or if that were something wilder and deeper. With a powerful thrust that pounded Jay's ass further into the carpet, Sean finally stopped teasing and pressed his vagina on top of Jay's cock, without bothering to move a hand to guide it or even to watch it with his eyes, doing it entirely by a self-assured, perhaps even "cocky", feel. Sean continued to do all the thrusting and grinding, exploring Jay's nipples with his fingers and Jay's mouth with his tongue...
Jay had a shit-eating grin plastered on his face... He felt warmly smothered on all sides as if a massage recliner had toppled over top of him, and he was content to just lie there, his dick doing it's thing, several times over...