John is one of eight mech pilots heroically protecting Earth from an alien invasion. Pretty easy on the moral choices. See evil monster from space, kill evil monster from space. Only then he actually meets one of them face to face.

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.