Mark's c**k throbbed hot and heavy in my hand, the skin velvet smooth over rigid steel. I could feel his pulse racing through the thick vein along the underside, pre-c*m already beading at the tip and smearing across my palm as I stroked him slowly. He was bigger than I had imagined in my secret fantasies, long and girthy, the head flushed dark and swollen. My fingers barely met around his shaft.
Doctor Harlan stood a few feet away, arms folded, watching us with clinical intensity that somehow made everything hotter. His eyes flicked between my grip on Mark's c**k and the way my thighs trembled, my p***y exposed and glistening under the soft office lights.
"Very good, Chloe," Doctor Harlan said, voice calm and authoritative. "Now guide him to your entrance. Mark, remain still until I ins
