A 3 way cowgirl is basically a threesome version of the reverse cowgirl. While the first guy is laying on his back and the girl is straddling him and having his penis plugged into her vagina, the second guy is straddled above the first guy’s face, and has his balls dangling in his mouth. Another way the side dude can participate is if he stood straddled above the first guy’s legs with his penis in the girl’s face, therefore she’s sucking his balls.
Jason and Jessie invited Caleb to do the 3 way cowgirl with them. Caleb was bi-curious and had a thing for Jason, so he wanted to give him some head.