Yosuga no Sora: In Solitude, Where We Are Least Alone., Domestic na Kanojo Recommendations
Domekano is essentially a less controversial and more "serious" version of Yosuga, replacing real incest and porn with plot with a more shoujo-ish melodrama and conditionally realistic plot. Natsuo is also quite similar to Haruka, because both MCs are a rather rare realistic image of teenage boys in the anime, and not unrealistic chaste "accidental perverts". In the end, both anime are rather dark romance with large doses of erotica and teenage melodrama.
They are both love stories that involve sexual relationships between a high school boy and several female characters.