I have been fantasizing about being on the bottom of a 69 while a guy is fucking my ass. Have you done this?

I have been but you have to be the top guy on the joint sucking in order for the other guy get his cock into you. Another variation on having 2 in you at the same time. I also have been doggy style fucked in the ass while going down on another cock while a third guy tries to slide under me and have my cock in his mouth but is rather awkward to do depending on the sizes of the guys. I always envied women and their opportunity to have 4 cocks in them at the same time.

Damn!!

Four? What am I missing?