I actually read this a month or so ago. I really wanted to like it - I like regencies and the werewolf aspect was a plus. But I ended up not really happy with the story or characters. Simon is a werewolf (traditional type-changes just with the moon). Lily is raising his ward (her sister married his cousin) and comes to Simon for help when the boy starts acting weird - werewolfish starts at puberty. Simon tries to keep the family "condition" secret from Lily while also randomly trying to get in her pants. 
 There is no scene where Simon explains things and asks Lily what she wants. She's had to figure out everything on her own. Although Simon's mom does give her a few hints. And then in the end she's overwhelmed with lust from the full moon and goes running out into the forest. Ugh