My youngest son had a big cock and yes I was jealous of it. His GF at the time had big tits. She was tall, thin, long red hair with pale big tits and lovely pink nipples, and light red hair between her legs. You may have noticed I like spying on people. They were living with me and so I'd try to see her naked. One night I hit the jackpot. The curtain in their room wasn't quite to the edge of the window and lucky me I noticed this. As i peeked in my son was sitting on the edge of the bed with his hard cock standing up. She got on her knees and started licking him, She started sucking and moving her head up and down. After a few minutes of this she stood up and he laid down. She straddled him and slid her pussy down his cock. Lucky me, she was facing the window so I could see her tits bouncing as they fucked. As they're fucking I'm outside stroking my cock. We all managed to cum about the same time. Wish I could caught them a few more times.