First did this in college with my then boyfriend and my roommate (female) and that hooked me on eating ass and sucking cock that's just been up someone's ass. One of my favorite things was to have my ass eaten during my period. Fucking intense orgasms, not really sure why.
If that's not the hottest threesome, I don't know what is.....Fucking a babe in the ass while the other babe is rimming him....they both did it too!!! I'm a submissive bi crossdresser....I love his reaction when I spread an alpha males legs open and get my tongue in his asshole!!!