 If you liked
Kiss x Sis (TV)
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 ...then you might like
Okusama ga Seitokaichou!
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Both have lots of ecchi, and a simplistic plot. They also have a similar art style. In both of them, the main characters are in highschool, and the parents approve of their relationships.
Only difference is that Kiss x Sis is incestuous, while okusama isn't.