While his mother-in-law was taking a bath, the son-in-law became aroused... Could this lead to an even more erotic development than expected?! 4 hours DBNK-060

The son-in-law's mother took over the housework while his wife was hospitalized. Unable to resist, he peeked at his mother while she was showering. The mother reacted to the shower, and suddenly the son-in-law barged in, revealing his large, erect penis. What will the mother do?!