Not really thinking about it you sit on the floor, Max confused as his tail swished behind him, waiting for you as you bend forward to lick at the tip of your massive cock.
The salty taste of precum excites you as you lick it with your tounge, pausing only to bray for a moment before shoving your cock into your mouth happily, sucking all you could with a blush on your face.
"What are you doing? Haaw!" Max said, clamping his hands over his mouth after the bray as his own cock starts to quiver under him, Max still on his elbows and knees on the floor as his cock grows beneath him.
As you're sucking however something starts to change, your balls are quivering before shrinking slightly, and despite the massive length of your member you have to bend slightly further every second just to keep it in your mouth. The voice in your head offering it's own answer.
"Jacks don't lick their own cock, Jennies lick cock, and take cock. One of you was going to be the Jenny, and that's going to be you."
You didn't question the voice as you kept sucking, until your cock was too short to keep in your mouth. With a pout you put your hands back and leaned back before groaning and braying again, cum squirting out of your shrinking cock as your balls fully disappear into you.
Max on the other hand is currently stroking his own cock, groaning and braying himself as it finishes growing before he ejaculates on the floor under him. A goofy grin crossing your face at the thought of that cock entering you. You were gonna be the jenny of the pair, that would be nice.
Your cock stopped shrinking, a frown crossing your face, you weren't done yet. You needed more cum. Looking back at Max you see him struggling to get to his feet, his cock hanging under him as you crawl towards him, going under him and sticking your mouth over his cock.
"What are you!?" His protests are quickly cut off by brays and moans as his tail swishes behind him, a blush across his face at you licking and sucking his cock for all it was worth. Cum was greedily swallowed as your own cock shrank even move, the pleasure building in your groin as a small but wet slit opened beneath your cock, taking the place your balls previously had been. It was tiny but you kept sucking, and you wouldn't stop until you had your jenny hole.
For a good minute you sucked, Max giving in and just letting you get him off as he stood on his hand and knees over you, panting in lust as finally, your cock shrunk as small as it could before popping into your new vagina, which had grown large enough to take the monster cock you were currently sucking off. Your own cock rewired itself into a clit as you stopped sucking, cum drooling from your mouth as you crawled out from under Max, sitting on the floor in front of him with your legs spread, giving him a full view of your new equipment with a smile as he just stood their, eyes focused on your vagina.