Remus was reading, some mystery he was almost finished with and was fairly certain he'd figured out, when he smelled Sirius' aftershave. When the other boy didn't say anything right away he knew he had to be trying to sneak up on him and pulled a pillow from behind him.
When the curtains flew open he chucked the pillow at Sirius. Laughing as it hit him. "How many times do I have to tell you guys. You can't sneak up on a werewolf, especially not with that aftershave you wear." He grinned and closed his book, knowing that no reading was going to happen with Sirius around, especially not when he spotted the bottle in his hand.