There's nothing that I love more than the Magic-made-em-do-it trope. This list was compiled a really long time ago, so some new ones have probably popped up since then. If anyone has some great sexpollen-y recs, I'd love to see them.
Sam/Castiel
The Fever Called Living by
fossarian NC-17, Lack of attentiveness is never rewarded. Except when it is.
Reel Me in Before I Fall Out of Line by
rrrowr NC-17, The day had started out so normal. Castiel had been out of contact for about a week now, but when when he finally did show up -- in a whirlwind of energy and his hair and clothes caked in viscous golden liquid -- Sam got the inkling something might be amiss.
Cas/Crowley
Spitting Sentry, Horned and Tailed by
craww NC17, Castiel and Crowley help the Winchesters (not really significant to this story), and predictably experience tension when briefly forced to share extended proximity.
Sam/Dean
Some Kind of Strange Magic by
lustmordred NC-17, It may not have to mean anything, but they aren’t just two guys stuck in an impossible situation. They’re them and uncommonly attached to one another, so it will mean something and they both know it. This will change them and Dean can’t really blame Sam for suddenly being afraid to move.
Arms That Chain Us by
glorious_spoon NC-17, Trapped on the wrong side of the Veil, Sam and Dean do what they have to to get out alive.
Bad Blood by
astolat NC-17, "Fuck me or I'm going to die isn't the world's best pickup line." "I've heard worse," Dean said. "You've used worse," Sam said.
Kings and Queens and Jokers Too by astolat NC-17, "Yeah, you boys nailed that trickster real good," Bobby said, dry as dust.
Nothing to Lose But Everything by
bewaretheides15 NC-17, Dean's bitten by a succubi.
Top This by
leonidaslion NC-17, Dean's sure he's a top. Only problem is, Sam's pretty sure that's his job ...
Dean/Castiel
Our Ashes Live by
fossarian NC-17, Castiel can't say no, and neither can Dean.
I Will Take Your Pleasure and Your Pain by entangled_now written in libraryofsol NC-17, It's like going mad, or dying, or both.
Conservation of Space by
entangled_now written in
libraryofsol NC-17, There aren't a lot of things more tortuously unpleasant than killing a succubus, exactly two minutes after she managed to cover you in whatever passed for her crazy pheromone crap.
Get Me Closer to God by
obstinatrix NC-17, When the animal spirits possessed them, Dean did not expect to mount Cas in the street and get off on everyone else fucking one another around them.
The Second Circle by
electricskeptic written in
ink_electric NC-17, There’s nothing kinky or glamorous about this; it’s poison, working its way through his system slowly and methodically, and he has maybe fifty minutes left before it kills him.
Let Him Kiss Me With the Kisses of His Mouth by
FayJay NC-17, He feels like he might actually come in his pants just from looking at Castiel on his knees.