Gosh, that's hot! I only hear this moan and suddenly I had this tingling in my panties. The sound really turned me on, but at the same time there was this gnawing conscience, because the moaning came from my sister who fucks with her guy! The two of them probably thought I was not at home and simply left the door open. I went as close as I could, watched her and my hand went down to my shorts. I knelt right behind the open door and watched her kneel in front of him with his hard cock in her mouth. When she then sat on him and took him deeply in me, there was no stopping me. This intense moan made me tingle violently between my legs. I secretly watched how she fucked him and came to orgasm really cool!