When Remus mentioned dinner, Sirius realised that he himself hadn’t actually eaten anything since around 12 o’clock and likely should go get something to eat as well. This was perfect though, as he saw this as another opportunity to get to hang out and get to know Remus.<br/>Of course they didn’t have to become best friends immediately, but Sirius liked the guy well enough and really wanted to get to know him better. It was just nice to get to be close with the person you had to share living quarters with.<br/>“Mind if I join you?” Sirius asked, clearly not expecting a no, as he made no move to remove his coat.