My Best Friend's Boyfriend

This is weird.
I always thought I’d be jealous when Zayne found someone; I figured I’d lie awake at night dreaming up her untimely death or maybe picturing how beautiful Zayne would look when he finally struck her down.
I never expected to be propositioned by his new boyfriend to ‘perform’ with Zayne. I’m not even sure how it happened. Somehow in idle conversation, Zayne brought up the fact that we used to masturbate together. Michael (the new boyfriend) got kind of an odd look, then a grin. Now here I am in Zayne’s room with my pants around my thighs.
I don’t even remember what he said, but it must’ve been incredibly convincing.
I’m sitting next to Zayne in this surreal scene, and Michael’s sitting off to the side, just watching us. How the hell am I even supposed to get hard like this?
Zayne really doesn’t seem to think anything of it; he whips out his cock like it’s the most normal thing in the world. And suddenly, Michael’s gone and it’s like we’re sixteen again. I start to stroke myself, glancing at him as he does the same. I watch his fingers skillfully trace the ridges and veins of his already hard cock. His eyes slide closed as he strokes himself. Getting hard isn’t a problem anymore... And I realize it’s not like we’re sixteen. When we were sixteen I wasn’t watching him. I wasn’t thinking of my hand replacing his. I wasn’t thinking about what his lips taste like. I wasn’t thinking about him thinking about me. But goddamn I am now.
I feel the exact second Michael notices me watching. When I look up, his eyes are on me and that second-nature smirk of his is firmly in place. He crawls across the bed to Zayne, pulling him into a passionate open-mouthed kiss. Even from here I can tell their tongues are wrestling, and Zayne is moaning into Michael’s mouth. I catch myself slowing my strokes, wondering just what that tastes like... I was so focused on the kiss I didn’t notice Michael stripping him. Not until Michael’s eye cracks open and locks on me again. I can tell he’s grinning into the kiss even as Zayne melts submissively under him. That’s when I notice. Zayne’s naked. Completely, beautifully, desirably naked. It’s not that I haven’t seen it before; we’ve know each other way too long for it to be that. It’s just that I’ve never seen him like this. He’s never been what I wanted when I saw him before. Moaning, whimpering, begging with his body. It’s like the bastard knows it’s what I want. To bad I can tell he’s long since forgotten I was there.
Zayne’s hips are already bucking up, trying to get more contact. Michael somehow pulls Zayne’s hands away without even breaking eye contact, or the kiss. When they finally do break their kiss and I can see Zayne’s tongue flexing against nothing, imagining Michael’s is still there. Zayne whimpers open-mouthed.
Holy shit, I need to hear more of that.
Michael’s moving behind him, rearranging him...
Oh god, he’s facing me. Whatever Michael intends to do to him, he wants me to see it. I only barely realize I’m still stroking myself; I barely need to. He settles behind Zayne, keeping an eye on me over his shoulder before he reaches around, licking Zayne’s neck and stroking him just the right way to make him buck up. He moves just enough for Michael to slip under him. When he starts to settle again it’s much slower. Zayne’s face contorts for a second; I’m not sure if it’s pleasure or pain, but either way, it’s beautiful. He settles in Michael’s lap, but it’s not until he starts to rock that I realize what they’re doing.
In front of me. Oh my god, they’re having sex right in front of me.
At first I can’t believe it. It’s just too much, too hot, too fast. Zayne’s moans get louder and Michael gives me that smile... it’s unmistakable. But Michael wants me to know for sure. He reaches down, past where he was stroking, and grips Zayne’s thigh.
He lifts his legs just enough. Just enough for me to see his cock sliding easily in and out of Zayne. So I can watch each inch of Michael’s cock sink deeper into his body over and over again. Zayne’s head is hung back across Michael’s shoulder, begging and moaning shamelessly as he’s fucked. That image alone is almost enough to set me off, except that Michael’s eyes are still on me. He hasn’t looked away since this little game began; it’s like he knows how bad I want it, how bad I want to be him, and he wants to see me squirm for it. And yet, despite how bad I want to be him, I can’t help but feel it more with each thrust. Like he’s fucking me instead of Zayne. My hips are already rocking in time with Zayne’s, rising up with each of Michael’s insistant thrusts. I’m not sure if the panting I hear is myself or Zayne. I decide it must be me, because Zayne’s pleading moans are quickly rising into passionate screams... His body forces harder back against Michael’s, and we both shudder as he comes. His breath heaves, Michael still rocking almost violently into him. If it weren’t for Michael watching me so intently, I would have come too... but then Michael’s eyes fall unfocused and his first audible moans escape. His fingers dig into Zayne’s thighs and he bites his lip as he stills. Neither of them move, but I can see the tell-tale twitch of muscles, and I know he’s cumming into Zayne; marking him. Filling him.
The knowledge that it’s happening is enough. Me or Michael, It doesn’t matter. Just feeling that happen to Zayne, and the look of pure ecstasy on Zayne’s face... They’ll be burned into my mind for the rest of my life; and I cum harder than I ever have.
I almost cum again when Michael slides out slowly, and I can see the trail dripping down Zayne’s legs before they collapse together onto the bed.