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There's probably a few things that should have tipped Steve off.
Such as Eddie’s lack of post-blowjob babble. Or the sly grin as he climbs to his feet. The way that grin is all close-mouthed, no trace of the usual glint of teeth.
But he's too woozy from his climax, too delirious from the feeling of Eddie’s warm, wet mouth on him, too high on how pretty he looks, all wild hair and flushed cheeks and pale skin littered in bite marks. He doesn't realize what's happening until Eddie seals their lips together and opens his mouth.
Steve's first thought is that the kiss is weirdly … slick, like that one time he went on a date with a girl who refreshed her lip gloss every five minutes. Then it hits him that the kiss doesn’t taste like artificial strawberry, but like something else. Something bitter and salty, and-
He makes a little sound of surprise. Eddie just gently holds him in place with his hands in Steve’s hair, open mouth to open mouth. Waiting. Offering.
Steve hesitates for all of two seconds before he deepens the kiss. Eddie laughs breathily as he slips that wicked tongue past his lips, and then the warm bitterness of his own cum coats Steve’s mouth.
“And?” Eddie asks, once Steve has swallowed it all. He is glassy-eyed and panting lightly, lips impossibly pretty and shiny.
Steve frowns at him.
“And what?” he grumbles. His own lips feel slick. He probably looks very similar to Eddie right now. The thought makes him blush, and the expectant way Eddie’s staring at him certainly isn't helping.
“You said you wanted to try it some time,” Eddie says. “See what it tastes like. And I thought now was as good a time as any, so-"
“Yours!” Steve sputters. “Jesus Christ, I wanted to try yours, not for you to feed me mine like some sort of perverted momma bird. Why would you even- … Jesus.”
“It's cum, Stevie.” Eddie’s smile is positively impish now. Steve’s blush creeps from his cheeks to his jaw, all the way down to his neck and collarbones. “There's not exactly a huge difference. You thought it was like a wine tasting situation? You wanna see if mine has subtle notes of berries or wood?"
Steve closes his hand around Eddie’s cock.
“What if I do?” he asks, circling his thumb over the flushed tip. Eddie gasps, and he uses the occasion to steal another sloppy kiss. When he pulls away, he licks his lips, savouring the taste of himself, and Eddie moans. “What if I wanna see what exactly the difference is? What if I wanna find out right now?”
“Oh my God, please,” Eddie whispers.
It's cute, Steve thinks as he sinks to his knees, how quickly his boyfriend’s mood will change when he's given a taste of his own medicine. In fact, there's an idea. Maybe, if he feels like sharing, he'll save a little bit for Eddie to try, too.