Dave realizes he has a most unfortunate crush on his best friend. This is obviously a great foundation for a black relationship with Karkat. Competitive flirting is a thing that exists, the kids try out various bits of troll culture, Dave makes consistently excellent decisions and generally has his priorities in order (no he doesn't), and there's a whole lot of talking.

"I kind of... accidentally fantasized about Karkat while we were doing it. Which I do sometimes, not when we're messing around, just like-- uh, fuck, look, I'm--" Terezi puts a finger over your lips and you stammer to a stop. She nestles closer and sighs happily. "You too, huh?" You stare at the ceiling in bewilderment. Whatever response you were expecting, that was not it.

A cohort: bonded co-workers who share a common purpose, siblings, family, lovers, friends. What happens when Autobot sparks decide, for better or worse, that short-lived human beings are part of their cohort?

So, um. Terezi is kissing her. By the way. "Wowza. Lesbos R Us, at long last. I knew that day would come. Anyone got a camera." Terezi has a lot more teeth to get nibbly with than Karkat and her tongue is way longer and oh lord does she know how to use it. Jade wonders to herself, vaguely, why she never kissed her boyfriends' girlfriend before. That was a really silly oversight. Mmm. "Haha, shut up, Dave, you've been modeling for the Gay Dudes R You catalogue for like three years now." "Like you can talk, Mister It's Not Gay If He Doesn't Have Balls To Touch." -- oneshot, plus a couple of ficlet sequels.