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The Enterprise is on an away mission to a new planet. For once nothing is going wrong. Jim isn’t allergic to any plants, they’re not being attacked by anything, they just have free rein to explore and take scans of a really unique world.
Jim and Bones go off on their own and they’re exploring when, acting on impulse as he does, Jim suddenly grabs Bones’ face and kisses him. He’s wanted to do it for ages, but God it’s never seemed like the right time. He kept thinking it had to be special and romantic but he had suddenly realized that that wasn’t necessarily them anyways, and one of the things he loved most about Bones was how he never had to overthink around him so really, fuck it right?
Meanwhile Bones is absolutely stunned at first, eyes open and hands dropped to his sides. He’s too stunned to do anything, doesn’t even kiss back because holy fuck Jim Kirk is kissing him. Jim’s flirted with everyone but him for years - Jim, as it turns out, wanted it to be special with Bones - so Bones never considered that his feelings may be returned.
Jim pulls back. Maybe Bones isn’t into it. He thought he’d be heartbroken but he’s at peace, knows Bones loves him no matter what definition of love that is, knows this won’t break them. But Bones’ brain has finally stopped short circuiting and hey he wasn’t done with that, Jim ain’t gonna cheat him of his chance to kiss back so he does and Jim’s like oh. Oh. Yeah I thought so.
When they pull away they rest their foreheads against each other and Bones is smiling softly and Jim can’t stop smiling - not smirking just legitimately over the moon with joy, and they both know in that moment, before they’ve said the words, that they’re in love.