Well it is Mason's birthday coming up

Mason's birthday is the coming weekend, so you text with him to find a time to come over and give him a present. You slyly make sure it'll be a time when his new wife Sarah isn't around.

You want into his apartment and he gives you a big welcome. "Hey John! It's good to see you," and then he's surprised Emma is with you, "Oh hey Emma, I didn't see you at first."

You chit chat a little bit, asking about work and thoughts on the TV shows you're all watching. "So what's my present?" Mason asks, realizing he doesn't see any package.

"Emma" Emma steps forward. Mason just looks more puzzled. "Emma is your present." Mason still doesn't move or say anything, so you continue, "I'll help you unwrap her," and you help Melissa remove her jacket, revealing her wearing nothing but a pair of lazy black lingerie.

Emma steps forward to Mason. "Happy birthday, Mason." She proceeds to strip down even further, standing inches in front of him. She takes off her bra, slowly exposing one breast and then the other. Then she turns around, bends over, and slowly slides her panties down her ass. She it completely naked standing between the two of you fully clothed men.

"Whoa," is all Mason can say. He looks at you and you just give him a nod of encouragement.

Emma gets down in front of him, unbuckles his bet, and pulls down his pants. She takes his whole soft dick in her mouth with one gulp, but it's not soft for long. At first he keeps looking at you, but soon her forgets that you're there.

Mason is getting really into it. You know better than anyone what a good cocksucker Emma is and she's giving him the works, a wet, deep throat sucking. He's bucking his hips wide, but Emma can handle his thrusts like a pro. Emma worries he might be getting too into it. "Don't cum yet," she warns him.

Mason's eyes light up, "Oh yeah?" He figured a blowjob from a naked woman was present enough.

"We're just getting started," she tells him and leads him to the couch. She shoves him down and then climbs on top of him facing towards him, and slowly lowers herself onto his hard cock. You sit down nearby with your cock in your hands.

And then they fuck. For you this is all about Emma. You want to watch Emma fuck and you don't care who she's fucking. Letting her choose was just a kindness and that she wanted to fuck Mason, well that was understandable since he was your friend. But what you were staring at was a cock penetrating Emma's pussy. You notice the noises she makes when he grabs her tits or slaps her ass. You notice her breathing and how it matches with his thrusts. You are mesmerized by the movements of her hips, how they seem to just beg for him to cum with every movement - how they seem to long to milk him dry.

You stroke yourself as Emma pulls Mason's head to her chest, burying his face in her tits - and still when she leans down and kisses Mason deeply. Mason grabs her ass checks and pulls her tightly to his body exposing her puckered asshole to you. You had a thought of sticking your own cock inside of her then and there. Perhaps you would have if things continued, but as you're deep in thought thinking about double-teaming Emma, Mason announces that he's cumming.

Emma loudly encourages him to cum inside of her and this triggers her orgasm. They continue to fuck through their orgasms and you see cum leaking out of Emma's pussy and down Mason's cock. The sight of her pussy literally overflowing with cum is too much for you and you cum as well. You cum all over your hand and just wipe it on the couch, let him deal with it later, you think. That's a fair deal for letting your best friend cum in your girlfriend's pussy.

After you all quickly clean up and get dressed (not that Emma has much to wear) you and Mason share an awkward moment where you normally would have shaken hands goodbye, but you realized at the same time that you didn't want to do that tonight.

"Thanks man!" Mason tells you again as you and Emma walk out.

"Anytime" you and Emma reply simultaneously.

When Mason realizes the possible implications of "anytime" you're already long gone.