Okay anyone wanting to fight him. They are not ready yet to come out as a couple, they havent even confessed to each other (albeit a ton of other stuff has happened between them). There has not been an "I love you" or "I want to date you" exchanged, they are just really horny for each other.
Rihito has presented her his issues and why hes uneasy after being urged to rely on Noa, gets called cute instead.
I had this exact scenario happen to me and it did not go great.