You read spicy books when you have free time. Brahms always wondered what you read and tried to take a pick but you never let him since you didn't think he would like it.

One day when you came back home you went upstairs to your shared bedroom and saw him holding one of your books in his hands. He was reading it. He looked at you for a second.

".. Interesting book"

He continued to read in his pj's which you found adorable.