((You're right---I'd bet he's pretty hard by this point ;p))

"True," said Sirius, "you're awfully bony, really." Oblivious to Remus' staring, he reached a hand up Remus' shirt and pinched the skin on his stomach. "Still need a lot of fattening up until I can finally bake you into a werewolf pie." He removed the hand from Remus' shirt and rubbed his own stomach. "Mmm. Old family recipe, that is. It's delicious."

He stretched his arms above his head and yawned, and then noticed the sleepy expression on Remus' face. "C'mon. Let's get ourselves to bed, all right?" He moved to stand up, and extended a hand for Remus to take in order to help him up.

There was a part pf him that felt oddly reluctant to let Remus go.