Both, but mostly Hedgehog girl.
To put it simple, they have a sleepover to help Oscar(Elephant) get over his seperation anxiety, Max (Bat Dude) invites himself and Hedgehog bends over herself to try to impress him cause crush, forgetting/ignoring that this was supposed to be a thing to make Oscar not feel like shit, she then throws a gasket because Oscar didn't like that everything was getting fucked up, Oscar storms out and admits to that he has a crush on Hedgehog when getting a therapy speech from the Poolshark/Noodle and then his Pajamas assumes Direct Control and dances like a tard, which impresses Max and Subsequently Hedgehog, just as Oscar stops being a moody bitch he notices Max and Hedgehog are gone, having ditched him without telling, and sees that they are outside kissing, he makes a anguished face end pilot. I think it went like that anyway, i only watched the pilot once.
Basically, it gives a impression that Hedgehog put chasing boys over her supposed friend feeling like shit, and also that Oscar was cuck for putting up with her doing so.
The first episode is basically a much improved version of the pilot, going platonic was definitely a good choice.