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

She taps a button on her phone and an unfamiliar sensation wracks your crotch. Your pussy pulses and... ripples? It almost feels like... no.

Erica chuckles. "Sorry, roomie. I'm not really into girls." You look at her in horror before doubling over as your pussy throbs outwards. Something feels like it's coming out. You rip your leggings and panties off just in time to see a dick forming as your pussy turns itself inside out. A full cock grows from your crotch, followed by a pair of testicles flopping out. 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 fully formed dick and balls.

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 she do this?