Aight so I can imagine one of the moriyama brothers and nathan finding themselves in what i call a dcnc situation (dubiously consensual non consensual) which is between cnc (planned out consented to bdsm scene between characters) and noncon (sa happening between characters in a story that the reader consents to reading).
Which is. They are both very proud individuals so I imagine finding out they have a crush on nathan is devastating and shit so they ask him to "assault" them, to not even look at them during the act, to just get it over with rather than have regular sex with them because they don't want to have made that choice and have that responsibility in the dynamic OR ne honest with themselves about their attraction to nathan. and nathan being nathan agrees ofc.
Anyway which brother more likely
okay i wasn't sure if in this ask you meant the moriyama brothers sr (tetsuji and kengo) or jr (riko and ichirou) so i'm going to answer for both.
i think between tetsuji and kengo, tetsuji is more likely to actually ask this of nathan because he's just not as able to suppress his wants as kengo is (second son, hasn't had as much practice in self-denial). i do think no matter what sex between nathan and either of the brothers sr would be incredibly funny because it's like. this is just a bunch of middle aged men in charge of crime syndicates acting like college kids with communication issues. at least ichirou and riko have the excuse of actually being pretty young.
between riko and ichirou i think ichirou, shockingly, is less able to suppress his wants than riko. i actually think it's kind of interesting how this gets reversed between generations where, with the sr brothers, the younger brother is arguably freer, but with the jr brothers the older one is. i mean ichirou's living situation just seems less materially restrictive compared to the nest. so i think between them ichirou would be more likely to cave and ask nathan to dcnc fuck him because, like tetsuji, he hasn't had as much practice denying himself. (not that he hasn't had Any, but it seems like most of his material wants are getting satisfied.) also in terms of access it feels like ichirou is more likely to be allowed to have casual sexual encounters like that, as in his communication access and physical location, based on the vibes i get, would be less regulated. i think any fucking that happens between nathan and riko would require nathan to go to west virginia on his own first whereas ichirou can just make what the youth are dubbing a booty call.
