Fuufu Ijou, Koibito Miman. - Vol. 10 Ch. 58

[TrueWarriorJak]

Tenjin is still into his NTR-fantasy of Being in love with a married woman, and that woman is married to his brother.
Thats some other level NTR lol

Its not really NTR when he was never in a relationship with her like he himself said he always knew it was one sided given the age gap but still its not something you can get over easily, definitely feel for the dude.