I love the very first paragraph where Snape's facial features actually hurt from the sneering and frowning. So funny. And it was funny how upset he got over the thought of Harry and Ron possibly being an item.
Snape in the bathtub, fantasizing and wanking, watching his hands, like he was the one who was only 15, was great.
I love Snape's jealously and the fact that he can't seem to do without some kind of interaction with Harry.
I love that Snape gave into his own urges and claiming Harry in such a way, actions and words. And I loved unsuspecting Harry. His thoughts during Snape's attacking kiss and giving in was great. You painted a 15 year old boy's first blow job perfectly. As well as his confusion when Snape backed off.
I like that Harry approached Snape in the Great Hall and Snape's interpretation of him approaching. And the sex was hot!
And I love how Albus responded at Snape's appearance to class, only telling him to be "flushed" at a more convenient time. And his conversation with Harry. Ambiguous consent. Maybe Albus is a pedophile at heart and wouldn't dream of disrupting such a relationship?