He'd prefer if you had something else...

He taps a button on his phone and an unfamiliar sensation wracks your crotch. Your cock pulses and... ripples? It almost feels like... no.

Eric chuckles. "Sorry, man. I'm not really into guys." You look at him in horror before doubling over as your cock and balls seem to suck themselves into your body. You rip your jeans and boxers off just in time to see the tip of your dick getting pulled inside your new pussy. The feeling continues for a short moment before stopping and getting replaced with a different unfamiliar throbbing. Looking in disbelief between your legs, you now have a hairless pussy.

You look up to see your roommate grinning. "I'm half-surprised that it worked! I wonder if it works the same as the real thing?" You didn't even know the implant was capable of this but now you're mad. You get flush with anger. How dare he do this?