Hello! I just bought this game and I've been enjoying it very much. My one suggestion would be to change the description slightly on Brandon's route. I think it's more than a 'significant' amount of content regarding the cocsa/csa/child abuse: it is approximately the entire route and almost all of the sex scenes in said route. I think 'significant' would have been fine wording had it been about 50%-- or even 70%-- of the route and then the last part ~30% of the route focused on the MC as she was dealing with the after-effects and possible reconnections with Brandon during her college time, but the oldest they get in route is around 15.
In order to avoid spoilers, I would call it a backstory route set prior to the time period of Sebastian's route more than anything else. This way, it would be much clearer that there would be very little content of them interacting as adults given that clearing one of Sebastian's endings is a requirement to unlock Brandon's route in the first place.
That said, I did enjoy the route very much as I felt it very clearly portrayed how such relationships develop, the imbalances of power and expectations, as well as how inner family politics affect the entire unit. It's just a suggestion of wording so that those who are expecting any sort of meaty interaction between the two of them as adults don't hold their breath. On the whole, the warnings for scenes were very accurate and I appreciate and recognize the overall care given to this game. It's a very interesting game and I'm glad to have paid for it.