The girl blew the guy off because he can't kiss or fuck. He's still a virgin. So the mother is right - the daughter should help her foster brother become a man. And mama wouldn't wish no harm on him. Lucky the kid's got such advanced parents.
Her mouth was doing a great job on his cock! As for me, I would limit myself to the mouth - so relaxed to myself and catching a buzz. If even a gulp and lightly massage his lips after that - full flight! I love it when a woman can work with her mouth. And on the second run, you can already fuck her!
I think the video is just wonderfully thought out, because there are such immense asses, that you can't go without a big bolt, especially where double penetration, so you can see how she's enjoying her high spanking.
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Yes, I too sometimes like to have tender and sensitive sex. And, by the way, I noticed that in this case the orgasm is a little, but brighter.