It starts innocuously enough, just a simple gesture. It starts with Gabriel early on when it's just the two of them (the two of them... romantically, anyway, but Dean's there just usually off to the side making gagging noises whenever Gabriel shows up and stands close to Sam the way lovers do). The first time is the morning after their first (and second and third) kiss. Sam wakes up with a migraine between his sleepless-swollen eyes. Dean keeps the lights in the motel room off and pads around silently in his socks. Despite the rising nausea Sam sits at the lopsided table of the room, slumped in his chair and head tilted down with eyes closed because even the lights are off it's still too bright. Gabriel flutters into the room then and the beat of his wings is too fucking loud so Sam groans. His lover doesn't say anything, just puts a cool hand on the back of Sam's neck and presses his fingertips into the ticklish spots on the side of his neck. The migraine's gone in the next heartbeat and Sam sighs thankfully in relief. "You should just call me next time," Gabriel gently reprimands but doesn't say anything else, just starts moving his hand, massaging the back of Sam's neck.

Blissful pleasure runs down Sam's entire spine and he lets out another groan for a completely different reason. Gabriel just hums, digs his fingers in harder, and says, "interesting."

Gabriel of course discovers that Sam's long, long neck is perfect for kissing and biting. But it's like they both forget about it until later, the first time Castiel joins them after everything. Castiel lays on top of Sam, kissing Sam, while Gabriel lays beneath them both and somehow cradles Sam with his smaller frame. Sam's close with his archangel groping him, touching and stroking him, wet and slick moving in and out--taking Sam apart and putting him back together. Sam bites his lip and looks up desperately into blue eyes, begging his new lover to do something. “I’ve got you, Sam,” the angel promises, rough and deep and so good. He leans down, intent on kissing his way up Sam’s throat to his mouth, but doesn’t get that far. His teeth accidentally scrape over Sam’s Adam’s apple and Sam loses it, crying out as white sparks behind his vision, falling forever in the tight circle his lovers make around him.

When he opens his eyes (Sam wonders when he closed them), Castiel is looking down at him curiously. They’re both still hard—Sam realizes with a measure of embarrassment that he came too soon and unexpectedly but what the hell else did they expect when they were both driving him so crazy with all of the good things they were doing to his body? So they’re both hard—Gabriel still inside him and Castiel hot against Sam’s thigh—but they’ve both stopped moving. Gabriel breathes, “damn, baby” into Sam’s ear.

Castiel’s blue eyes, however, are totally consumed by the black of his pupils (by a piece of eternity lodged in those eyes). Dry lips wet from kisses are parted softly as he hums, “interesting”.

And now here they are a couple of weeks later, the three sitting on their bed, pressed together. Sam’s in between them, Gabriel and Castiel’s legs wrapped around and over him to keep him still—not like he would try to get away if he was allowed to move. Gabriel’s in front of him, hot tongue and lips sucking on the tender skin right below Sam’s chin. The archangel’s administrations crinkle through Sam’s body straight to his dick, which is already leaking sticky pearls against his and Gabriel’s skin.

“Guys, what—seriously, I-” Sam gasps, not sure what he’s going to say but feeling that it’s important to at least try. Both of his angels had practically attacked them just a few minutes ago, had snapped away his clothing and pulled him between them. And now they were just… kissing his neck. And biting… and licking… and ooh.

“Silence, Sam,” Castiel commands somberly in the way that makes Sam gasp and his belly clench. Then the angel, who’s behind Sam, gently circles his teeth around the knob of his spine at the base of his neck and—and—

Sam didn’t even know that spot would be such a turn on.