Nanami hated the cold and since the spring was colder than usual. He sometimes stole the blanket, while sleeping. It wasn't his intention and you knew that, but it was still bugging you.

So, you decided to buy another blanket, just for tje cold nights. You two could get comfortable together, without someone stealing the blankets.

When you laid down with the selare blanket and got comfortable. Nanami walked out the bathroom and saw the two blankets. He looked rather irritated by it.