Koi Kaze, Yagate Kimi ni Naru Recommendations
Realistic approaches in both anime in which the protagonists try to understand their peculiar/different kind of love and deal with it. Koi kaze is about a brother loving his sister and Bloom Into You about two girls loving each other.
Both deal with "forbidden" love on the surface but are much more than than that. Both are deep and intricate psychological studies about realistically portrayed people on a journey of self discovery through the "lens" of the affections they have with each other. Both are very subtle introspective shows with strong direction. Both share the same slightly muted color palette.