I'm trying to understand why the dev designed the younger brother with visible eyes, and the older brother with "hidden eyes".
Usually the "No Face-kun" character (
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) represents the MC. In vanilla hentai he gets laid, in NTR hentai he gets cucked.
I believe artists make the MC/protagonist have a blank face like this to make his personality "empty", easier for people to self-insert as him.
So I'm thinking the dev intends for players to pick the older brother. This is a NTR game.
The ability to play as the younger brother is a bonus, it's in there to please the masses that are into vanilla / netori.