GENIUS IDEAS
Sirius caught Remus heading into the bathroom to have a shower and an idea struck him.
He smirked. Remus might kill him, but it would be worth it. As soon as he heard the shower turn on, he pulled his wand out and whispered "Alohamora", causing the door to open with a click.
Very quietly, Sirius grabbed Remus's towel and all of his clothes and ran away.
Then he waited.
"SIRIUS BLACK! BRING MY CLOTHES BACK NOW!"
And now Sirius had a perfect excuse to walk into the bathroom and see Remus naked.
He grinned. "If you insist!"