Tro and Choan's flat (and eventually Riley's, too)! Choan has the bedroom & Tro sleeps on the couch, but they both later share the bedroom and give the couch to Riley when she moves in.
This picture... I'm guessing they were posing for a photo-op, then at the last second, Tro was like, "Let's do a silly pic with my tongue sticking out". (That def. sounds like something he'd do)
Perhaps the sketch that best sums up this trio: Ti waxes on poetically about one of his wild adventures, Tro is completely riveted, and Choan is just staring off into space like, "whatever, mate".
Some literal "warm up" sketches- I sketched some of my OCs in their winter clothes! (I might do another batch of sketches like this with some of my other characters later)