Abormal: Protagonist is a woman. Her brother makes her give a swimsuit show to his friends after he wins a bet. The mom also joins in.
photo hunt: MC (son) removes mom's top in public
Business of Loving: MC(son) can make mom jog naked
Corruption: a classic. Son corrupts many women, but notable scenes with mom and sis: sauna with neighbours, cafe, public pool.
Waifu Academy: MC(son) uses knocked-out mom to teach some kids about female genitals
