I honestly get what ur saying but put yourself into the big brother shoe.
1. The big brother thinks that Yuuto is straight.
2. Yuuto is his little brother.
3. Yuuto has always been with girls.
4. Hes also popular with girls.
5. Yuuto showed no interest in him otherwise from being a brother.
6. Ryu was scared of hurting Yuuto.
So I understand where Ryu is coming from.
I was thinking just the same!! I really don't like people playing around and having sex with just anyone. ヽ(`Д´)ﾉ
me tooo, I don't care if uke and seme are not engaged or aren't dating, I feel bad the same , sometimes I feel so bad that I scream and stop reading the manga, that was not the case but I screamed really a lot!
I don't like when uke sees seme with other man/woman, plus I didnt't like this kind of seme: I know he restrained himself for Yuuto's sake but he was too blind and he made him suffer too much! All my love went to Yuuto, poor baby.