While I don't fully agree (if only in the sense that this is fictional, and older teenagers tend to be a grey area for a lot of people in the manga community), I appreciate this topic for how respectful it is. You're just giving your opinion without being intrusive about it, and I quite enjoy seeing that on this site, where that's not always common.
Never-the-less, those are still some valid personal critiques. It actually put me off a bit learning about the age thing too, but not enough (personally) to fully take away what I enjoyed about this manga. Including Volume 2, but like I said, still appreciate this topic! And I'm sure the age thing put off a lot of other people too in the way it did for you, so I think this story just would've benefitted better with the Uke being in college instead. I know I wouldn't have enjoyed it any less (probably would've enjoyed it more).
(My mind boggled and took a pause at the gambling thing too. Like, sir? That's not a stable or sustainable way of living XD)
Should have ended it at vol. 1 ngl lmao. Vol. 2 definitely made me feel REALLY weird about this story. First of all mc is a minor... Ml is 23. Ml gambles for a living like wtf??? There is no way he has stability in life. Also he obviously knew mc is a fucking minor and yet he fucked him so idk....