Don't Worry Mama - Narise Konohara, Yuki Shimizu
Yaoi novels are a mind trip. They're definitely yaoi, with ukes and semes and borderline to way over-the-line rape. But they're also interesting because you're let inside of the character's minds a whole lot more than with the comics, and these stock characters are fleshed out, their motives made more clear.

This one was ... hm. I liked that the uke didn't lose all of the weight, that was interesting. I expected the author to completely slim him down to a waif.