You follow the lead of the pictures

A new picture shows on the monitor, this one a double-teaming. The blonde is getting a cock in her pussy and another in her mouth.

You're tempted to keep sucking, but the itching need in your pussy overrides that and you trail the dildo down your body to the sparse black bush of your sister, leaving a glistening trail of saliva in the dildo's wake.

Sadly for your aching pussy you only just get to pump your pussy a few times before the picture changes yet again. It's yet another big-boobed blonde (you never realized you had such a thing for blondes before), but frustratingly enough this picture shows her deep-throating a black dick.

"Dammit, my cunt's so wet," you whine, and drag the dildo back up your body, popping the pussy-soaked thing deep into your mouth, pushing it in and out a few times before you manage to shove the head down your throat until only the base sticks out. A sense of pride fills you at the complete lack of gagging.

You catch the flicker of the screen from the corner of your eye and almost reluctantly drag the dildo out of you mouth. "God, I'm such a cocksucker. I must've sucked dozens of guys to have no gag reflex." The thought delights you and you look at what your next act will be, hoping for it to be in your pussy again.