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(Medical Experiments, continued by RandomShadfan...)

The silence only lasts for a second or two, after which Doctor Mandy asks “Jenny, what the fuck?”

“Well, I injected Steve in the butt with the serum and nothing happened for ten minutes. Then he grew a second dick, and I was in the middle of calling you when he started rubbing my asscrack with them both,” Jenny tells Mandy, grinding her hips up and down your two cocks.

Mandy looks less shocked now. “Jenny, I’m not surprised that you just let him fuck you. You never were able to control your hormones,” she tells the nurse.

“Hey, I’m pretty sure you’d fuck a guy with two dicks if you got the chance,” you interject, looking skeptically at the brunette.

Doctor Mandy smirks. “I’d be lying if I said I wouldn’t. In fact, seeing Jenny gyrate her hips over your two dicks is getting me rather aroused.”

“I’m afraid you’ll have to wait your turn,” Jenny tells her. “I called dibs first.”

Doctor Mandy unbuttons her lab coat to reveal her low-cut top and a thin g-string. “Hey, Steve is the person who the serum affected. I think he should decide, personally.”