I would start on her asshole and slurp my way up to her cummy cunt and clit , not missing a drop ! If Mistress is generous she would allow me to cum on her titties and let me lick it up !!!
What do you call it when you wanna do this but not with your wife; instead another couple? Not exactly cuckold. Like I would love to lick his butthole and suck his cock; lick her pussy and ass while he fucks her. They use me as a lube generator as they fuck each other.