It is especially stimulating watching my GF fuck a BBC. I guess is partly due to the color contrast, a black cock sliding into her Asia pussy. Also, some of the thrill is because of the risk of her getting pregnant with a half-black child. She is allergic to birth control pills and so we always depend on condoms. And, when she is ovulating that is when she is the hornyest.
The first time she had a BBC we forgot to have him put on a condom, probably because it was so exciting. After his cock in her and he was stroking it deep, I realize that he did not have a condom on, and she was ovulating that weekend. I tried to g\et her attention and ask her if she wanted to stop so he could put a condom on. Her eyes were glazed over and rolled back in her head. Finally, she heard me and slowly shook her head, "No." They fucked for about 50 minutes before he stopped and pulled out because he was about to cum. While we were taking a break I told him about our concerns that she might get pregnant. He told us then that he had a vasectomy, and could not get her pregnant. She was happy, because she liked the feeling of his bare cock in her. She told him that this time he could cum in her. After he went down on her for a few minutes to get her juices flowing again. he slid his hard cock into her pussy, balls deep with the first stroke. They fucked again for almost an hour. She wanted him to cum in her and kept t urging him to cum. But, after about an hour of fucking this time, she said her pussy was getting sore and she had to stop.
She and I ended up sucking his cock, and then stroking his cock until he came and came and came. The three of us spent about 20 minutes swapping jhis cum while she and he, and she and I French kissed.
That was probably number 2 on the list of most exciting song sessions she and I have had.