Sirius had seen Remus. That’s all it ever took for the usually bored bloke to stop whatever he was doing, which was boring to begin with, and change tactics over how to entertain himself. Remus just had a certain presence about him that made Sirius curious. James and Peter had it too, but neither of them did half of the things that Remus did, which meant they weren’t as funny to pester. Remus, on the other hand, made faces, turned colors, did all sorts of hilarious things when Sirius was around. Which made him want to be around. The vicious cycle of friendship.
After Remus had climbed up to the dormitory, and Sirius had counted to fifteen, he made his way up the stairs as quietly as he could so he could sneak in on Remus. The blasted door with its ‘CREEEAK’ nearly gave him away! Sirius froze at the sound and hurriedly surveyed the room. Remus moved, but from where Sirius was standing it looked as if the other boy was going to nap. ’Not if I can bloody help it!’
Sirius practically lunged from the entrance way into the room, and took a few rather large, rather fast steps forward before jumping up to land on the edge of Remus’s bed (thankfully missing the books Remus had decided to sleep with! The cad!). The bed groaned and pounded against the floor from the abrupt weight of Sirius, and he had to fight to keep from either falling off, or falling forward to squish the books and Remus beneath him. The bounce of his body had disturbed the pile, and some of the books scattered to the floor.