 If you liked
Futaba-san Chi no Kyoudai
|
 ...then you might like
Siscon Ani to Brocon Imouto ga Shoujiki ni Nattara
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A somewhat similar art-style and humor, both dealing with horizontal incestuous tension — where "Siscon Ani to Brocon Imouto" deals with only one pair of siblings with an age difference, "Hutaba-san Ti no Kyoudai" deals with multiple pairs of twins, each having their own unique dynamic to them.