Well, it had a nice title, but the NTR tag is on full display.
That ending though. Erm...Well, that was quite an interesting way of displaying the word "Sun".
Hmm...I'm kind of wondering about the circumstances surrounding how things became like that, because the way I see it, she was just a slut who likes dicks, and considering they mentioned something about "Choosing us" it's been going on for some time? I wonder if it can be NTR if really, they were never an item to begin with and he just kind of...had a one-sided crush on her?