Cuck

I would like to be a cuck for a MF couple. My wants are to rest my head on the woman's belly and suck off the guy if he wants me to. I would also like to lick his balls as need be and taste his wife's juices while he fucks her.
I am willing to eat his cum straight from his cock, her pussy or ass as well as her mouth.
If he would like me to lick and clean her ass and pussy before he goes in, that would be terrific too.