Fandoms and pairings:

Supernatural: Dean/Castiel (Destiel) (There's so much subtext that it's practically text. The only trope the writers haven't put in is an actual kiss), Sam/Dean (Wincest) (I wouldn't say I actively ship them, but fuck they're hot together), Sam/Dean/Castiel (Wincestiel) (Same reasons as for Wincest)

X-Men: Charles/Erik (Cherik) (Doesn't need an explanation. It's gaaaaay

Yu-Gi-Oh: Marik and Yami Bakura (Thiefshipping)

Kuroshitsuji: Sebastian/Ciel (who doesn't love them) and Grell/William (It's canon. Your argument is invalid. And it's sexy) and Sebastian/Claude (but only if I'm in the right mood)

Harry Potter: Draco and Hermione (Dramione), Draco/Harry (Drarry), Harry/Luna, Ron/Hermione (Ronmione)

Merlin (TV Series): Merlin/Arthur (Merthur) (Because if you don't notice the millions of euphemisms in each episode, you're obviously not listening)

Buffy the Vampire Slayer: Buffy/Spike (Spuffy) (Yes. Just yes. And it's canon too. Mmmm, Spike...), Dawn/Xander (When she's a bit older, e.g. in the comics (where it's canon))

Junjou Romantica: I love all the pairings, but Egoist (Horoki and Nowaki) is my favourite (The other two kind of just remind me of paedophillia in places...)

UraBoku: Hotsuma/Shusei (Also canon. And they're sexy. What more do I say?)