"Spread your thighs apart just a little bit more," I directed my sister who was grinning broadly over her shoulder as my hand lightly brushed her pubic hair.

"Okay Mark," I said, stepping back while trying not to let my hard-on make me too self-conscious. "You're going to line your cock up with her pussy but don't penetrate her until I say the word. I want to get this shot from a variety of angles." Damn! I love being in charge.

I took my time getting the camcorder while Mark got up on the bed and positioned his cockhead against Maryanne's pussy lips, barely touching them. She started rocking back...