Guiding it in.... Humiliating but very hot.

That's very close to one of my favorite things to do with the couple have her sitting as you described reverse cowgirl for her legs outside of mine and when she is settled down as far as she can get have her cuckold crawl over on his hands and knees and using only his lips and tongue on her lips and clit giving her enough orgasms that way so that eventually her contractions give me one and then he lick what dribbles out down my shaft and balls before it falls off onto the floor
oh! yeah. i enjoy doing that. licking the entire groin area, her and his. there is alot of dribbling with this position and moreso when he cums. thats pure joy.