My Son's Wife Is A Dominatrix, Mahiro Ichiki.

"You okay with shouting that loud? Your idiot son might hear you." My estranged son came back to the family home, saying he was struggling financially and wanted to live together. He'd even gotten married, bringing along a woman named Mahiro, his wife. I agreed to let them live together, honoring my late wife's wish, but everything that woman Mahiro did got on my nerves. I made snide remarks and criticisms every time she did housework. But then—that daughter-in-law reached her limit with my nagging. And she called me out. A dark room... and there she was? No, it was the mistress who called me 'big-faced babble-babble' and trained me. The most fearsome, greatest queen of the SM club I'd been going to for years...