One of my many fantasies involving my super-hung straight best friend and my wife is this:
He is sitting on our bed with his back against the headboard and his legs apart. My wife is on her hands and knees licking and sucking his cock. I am sitting on the edge of the bed watching the proceedings. My heart is pounding like crazy as I witness how totally turned on they both are by each other and as I see the head and first third of his gorgeous cock disappearing into her throat.
Amid his heavy breaths, my friend looks over to me stroking my cock and says, "Why don't you go ahead and fuck her?" With a mouthful of cock, my wife moans in a way that indicates she apparently concurs with his suggestion. I come around in back of her, get on my knees, and press my cock against her wet cunt. I slide in easily and start thrusting. Her head mostly blocks my view of his cock, but I have plenty to look at as I plunge into her -- her beautiful ass and back, his powerful chest heaving with each breath, and the incredible passion in his face as she sucks him.
I don't last nearly as long as I would like, but it is an incredibly powerful orgasm. As I pull out of her, she tells him that now she wants his cock inside her too, and she directs him to slide down on his back. I love her assertiveness. She gets up above him and rubs the head of his cock against her cunt. I am watching from his feet as my cum drips from her cunt over the head of his cock and runs down over its full length to his balls. What a fucking turn-on!
My wife begins to take his cock up inside her, and trembles uncontrollably with excitement. As she backs off of it, more of my cum oozes out from inside her, and then she moves down still further around his cock. Eventually, she works his cock all the way up inside of her -- every last centimeter -- and it does not take much contact between her clit and his pubic bone before she is cumming like crazy.
Once she has calmed down just a bit, he tells us that he wants to pick up where I left off, so my wife gets off of him and puts her ass high in the air. He comes around in back of her, gets on his knees, and wastes no time in entering her cunt.
The main event is underway. He thanks me for lubing her up so well and urges me to come closer to watch, exhibitionist that he is.
You know the rest.
...and later, the three of us are off to our favorite restaurant for dinner.
For me, the thought of watching his huge cock stretching her cunt wide open, pounding deep inside, and blasting his cum into her is a rush like none other.