It's Brian, from the party the dude that jizzes in the girl's panties and puts them back, confessing to her. Normally for non-ntr games, when they get confessed to by side characters, it's a quick "sorry, no" but instead she gives a reply e-mail that leaves it open to go either way with him. Also, when you confront Brian about the whole masturbating in the girl's underwear at the party, Niki is super quick to defend him.
Honestly, this whole game appears to be the dev's experiment to see how close he can dance near the line of NTR without crossing it.
1. Chick already in a relationship that wants you to commit to her but won't commit herself
2. Chick flirts and literally lets you stick your hand in her pants but then fucks your brother
3. Chick gets confessed to and has been left open-ended so that she could easily get with him if you don't pick the right choices in future versions.
4. Older woman lets you basically grope her ass during a massage but makes sure you know she's going on dates with someone afterward.
5. Past ex-girl leaves you with no real explanation, suddenly appearing (in future versions)... man the NTR vibes here are fucking awful.
And then there's that dream with the mother, dad, and brother. Jesus. Just slap the NTR tag on the game and be done with it, because this game's thread is going to be full of NTR discussions. Anyone who doesn't like NTR is going to see them and immediately back off.
