Total Recommendations: 1
If you liked
Domestic na Kanojo
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...then you might like
Unbalance x3
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Both include a mature sister love relationship that are considered taboo. MC is a student in both series. Domestic na Kanojo is more of how the MC adapts to his new family/both sisters. Unbalance x3 (at least until now, chap 61) focuses on the brother-sister in love relationship.