You hated your enemy that much THAT you would litteraly take all his clothes after he finished showering and make him go walk around in his boxers.

He finished swimming and quickly went to take a shower. As he took a shower, you slowly sneaked into the room, taking everything and leaving him with his boxers.

He awkwardly went around the hallways of the school with boxers. Once he saw you his frown deepened and his pinned you against the wall.

"Why. Just why?"