6 Books Found

Based on your description:

"I’m looking for a book with the brothers best friend trope. I don’t want them to have known each other for a long time, the brother has a new best friend after maybe one of them moved towns. His sister also starts spending time with him and they have a lot of tension. I was imagining a specific scene where they’re secretly dating or fooling around and he hides her under his covers or she hides him under her covers. I prefer if they’re in high school but collage is okay as well."