AU where Dave is a famous rapper and Terezi is a big fan of his, Karkat doesn’t give a shit about him because unless it’s the Fresh Prince opening, rap isn’t Karkat’s thing. But one day Terezi drags him along to a concert because she won 2 backstage passes with a chance to meet Dave, and no one else wanted to go.
Karkat goes begrudgingly and has an OK time at the actual concert. Afterwords they go backstage and as soon as the walk up to Dave for autographs and Dave sees Karkat, all he can think is “holy shit????? this guy??? is rly cute??” and despite being the famous one, Dave is a huge awkward mess. Karkat says he doesn’t want anything autographed but Dave insists on giving him something and gives him a free CD with an autograph on the back, and under his signature, he left his number.
Karkat is skeptical at first but Terezi just HAS to know if it’s Dave’s real number so after a couple weeks, Karkat brings himself to call Dave, thinking Dave wouldn’t even remember him. Dave has pretty much been waiting for that call the whole time but he’d never admit to it.
Eventually they start dating, but don’t show it too much in public, so they can hide it from the tabloids. Until at an interview Dave accidentally lets it slip that he has a boyfriend, that was the first time he’d ever officially called Karkat his boyfriend. Headlines are every-fucking-where about who the hell his boyfriend could be, so to clear it up, he calls Karkat on-stage during a concert and introduces him as “The guy i’m in love with, who wasn’t even a fan”