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Love threesome (twins and their big brother)
As the eldest son of the Kadokura family, Kouhei’s biggest headache is his younger twin brothers, Aoya and Shion. No matter how hard he tries, every romance he pursues somehow gets derailed by the twins. Just when the still-inexperienced Kouhei finally lands a matchmaking session, the brothers drop a bombshell “Our true desire is you, big brother.”
Love between twins
Azuma is in love with his twin brother, Miyabi. Though Miyabi is a genius archer, he is completely inept in every other aspect of life and depends entirely on Azuma. Caring for Miyabi is something Azuma cherishes deeply.
(They do not look alike at all, prolly the art styles)
Jade Leech x Floyd Leech (DTW Doujinshi)
A mysterious plant suddenly became a tentacle and slowly changing its form, becoming more and more like Jade in front of Floyd when the real Jade was away.
(Not literally incest)
Uchi wa Futago de Teippai!