The absolute best part of this book is the beginning flirtation and banter, where Mally starts to act on his feelings, and Sam starts to look at him differently.
Second best was the maturity they both displayed in discussing wants, desires, and feelings. No miscommunication trope here folks. I’m not a fan of friends little sister being considered taboo, but in this case I think the taboo element is because Sammy has a rape fantasy, and there a lot of complicated feelings for both of them around that.