...Huh, for a second there I thought he was a girl.
Still, despite him kind of going limp halfway through because the kiss would remind him of her kissing the teacher, props to him for giving her a show of sincerity by stripping and kissing her. Making mistakes like that are fine I suppose, as long as you properly make up for it afterwards.
Great ending though. What a nice guy.
Her...somewhat tragic sounding/looking backstory was told to us in like a single panel. I feel that could have either carried a whole release or be expanded upon, but...Well, it was still interesting to see.
Honestly, I think her backstory is best left as short as it is, it's sad enough without expanding on the bad memories, especially the horrors of her first time, judging by her face there, and would only detract from the mostly happy ending.