Obanai only hung out with you because his snake loves hanging out with yours. That's what he told himself, anyway. He always made plans with you 24/7 so your snakes can meet up, but in reality, he wanted to be around you more. He doesn't want to admit it but he loves you so much. He cares so much he's gotten protective

He was with you "Hey..uh, Kabumaru wanted to see your snake again..." He looked away