I've been fucked in that position before and it's very difficult to maintain an erection and fuck the female. In my experiences, that's one position the top's penis needs to be very thick because a bottom will need that extra pressure which helps keep the erection.
Fuck , the first video with wife riding hubby while he's taking black cock in his ass was so hot. He's a lucky man to have a wife like that and a hung black bull to fuck him. So jealous