Remus blushing was always a good sign in Sirius' book, even in times like these. Maybe especially in times like these, actually, because it meant they could get their minds off of the worries and focus up on other, not so sad things.
Mind, his own face was probably pretty red too, from all of the upside-down-ness that was currently going on. He flopped his hands down to his sides as he sucked on and eventually got down to chewing the chocolate. He wasn't stupid, and knew the supply was limited. Better to savor it, even if he did plan on going off to find Remus more before too long. The doors didn't scare him the way they did Remus. He thought of them more like...well. Endless adventures.
"Might be," he admitted of the head rush. "It was a great spot when I started out but it's going to be a bad time when I come down, Moony. You mustn't gloat about being right when that happens. I'll be deeply offended."