Geoff hit the save button and turned to look at Aidan. "You know I've wanted you...but no, you are too good for me...friends, thats all...whilst you sleep your way around campus? Not any more..." Geoff smirked, Meanwhile, that strange sensation came over Aidan once more as he shudders. Aidan begins moving towards Geoff, involuntarily presenting his ass to the other man. Geoff shivers at the sight, his cock quickly becoming erect as he starts to strip.
Both of their movements are fluid, though neither are in control. Geoff teases Aidan's entrance, before roughly shoving into him with a moan. Aidan, finally finding himself able to force past the Cronivac's control just enough to speak, practically screams at the sudden intrusion.
Suddenly, both men are released completely from the control of the System, Geoff taking advantage immediately to grind hard against where his balls hang against Aidan, who starts squirming.
"No, no, Geoff, whatever you're doing, whatever's happening to me, make it stop, please, Geoff, please, you can't do this Ge-" Aidan's voice is cut off as Geoff roughly shoves his fingers into his mouth. He pulls out of the man beneath him, slamming back in so hard he manages to pop his balls into Aidan along with his cock - or, perhaps, that was the Cronivac.
Aidan's arms continue to glue to his sides, slowly fusing until they're no more. He tries his best to worm away from his former friend, only for Geoff to hold him in place or go along with him, the genitals buried in his ass never moving.
"Ohhhh, Aidan," Geoff hisses through clenched teeth, "you feel so good on me, and it'll be so, so much better soon, just you wait." Aidan screams again, muffled around the fingers in his mouth, as he feels his legs changing, curling in up on themselves, his head being forced to look straight up, and himself slowly shrinking.
Geoff moans as he feels his tool inside of Aidan slowly disappear, sensation sharping a thousand degree as he feels his wet fingers from two perspectives. He reaches a hand down, caressing what used to be legs, now slowly fusing together to form a large sac. Both of them moan, and soon Geoff is frantically running his hands along Aidan's changing form. Aidan himself is horrified at the sparks shoot up and down where his spine used to be, at the all encompassing pleasure of Geoff's hands on him.
Aidan moans, the first since his last ejaculation with his now-absent micro-dick, for the last time, his voice rising just as it's cut off. Geoff's hands cover more and more of him as he shrinks, the larger man thrusting desperately into his hands. As Aidan's features finish blurring and vanishing into his new form, he tastes a salty bitterness, feels the semen rush out of him, as Geoff finally cums.
The newly-formed cock slowly deflates, falling flaccid between Geoff's two legs. Geoff slumps over on the floor, aftershocks of pleasure running through him from his first session with his new huge dick. He takes a while to just bask in it.
Aidan, meanwhile, is both disgusted and horrified. He had no limbs of his own anymore, literally attached to another living being. Beyond that, while he could still hear, feel, see and taste everything going on, he had no way of communication, and looked like any other abnormally large cock.
Before giving up all hope though, he makes a final, desperate attempt at being anything other than under Geoff's control for the rest of time. He focuses his entire mind - or, at least, the remnants of it, - and tries to move.
And he does. Geoff looks down, shocked at the rapid twitches of his spent cock. They grow faster, flaming a pit of arousal in his stomach, blood inflating the former human to half-hardness. And still, his new penis twitches. And soon, it moves even more, curling itself up where Geoff is looking it right in the slit.
Geoff, despite encountering an unintentional effect of transforming a living, breathing human into his dick, finds Aidan's capability to move insanely arousing, the dick losing control as it hardens once again.