THIS FATHER-IN-LAW LIVES ALONE AND IS PRETENDING TO BE SENILE, BUT THE TRUTH IS THAT HE'S A HORNY SEXUAL MONSTER WHO IS DISGUISED AS A HARMLESS OLD MAN. TSUBAKI SANNOMIYA (2021)

Tsubaki Sannomiya agrees to let her father-in-law move in with the couple, because of his growing dementia. However, the father-in-law is not as gone as Tsubaki believes, as everything is part of a scheme. Eventually, he attempts to grope her and she let the incident slide. To preserve the peace at the house. Tough mistake.