Not least, the direct exchange of the penis from vagina to vagina is essential in shared sex. It's the way to make one woman penetrate another. It is crucial to penetrate each girl in turn. I've done this many times with my girlfriends.
The seemingly innocent game, the escalation of desire, the bisexual experience, and the partner swapping are what make this video surprisingly delicious. I must have come more than 10 times watching it, once in each segment: the gay blowjob, the partner swapping, the orgy, and the shared ejaculation at the end.