"Oh yeah! Oh fuck!" Maryanne's voice boomed out of the speakers.

"Are you jacking off? Are you pumping your hard cock, honey? Are you cumming with me?" I certainly was! My sister was breathing hard and slamming her fingers into her pussy.

My cock was rock solid and felt like it was about to burst. As the tension built and I felt the release coming from deep inside my balls, I positioned the tissues at the head of my cock. Watching my sister rub her clit, I stood up, pumping faster...

"What the FUCK are you doing?" Maryanne's voice bellowed from behind me. Oh shit! Jerking around, I saw my...