This girl knows too much here and did his mother knew that her son is not perverted in any way?? Basically I think he thinks of her as his daughter....
It's about self control indeed. I hope he was not a virgin in his previous life. It means he is able to pick a time for lewd stuff and not to drool at some exposed skin.
@firosahoge You a woman? Us men, or boys rather, at that age may not have started puberty yet. Don't forget girls start puberty earlier and finish earlier.
Don't get me wrong it may still be on the mind, but those urges or random boners won't be there for at least another year. (The manga mentioned he was 12)
"Old Man Inside"
Nope. Old man memories, kid body. Body includes physical brain.
If he isn't interested then fine, but don't go blaming it on him being old because he isn't any more.
And her chest lines are bizarre. Breasts aren't shaped like that.