The daughter-in-law, Iroha Natsume, was given an extremely strong Iroha Natsume anesthetic by her father-in-law, and not long after she got married, her father-in-law was unlucky, gave up her brother's anesthesia and fucked her to pieces. Every time he gets fucked, he knows but can't do anything else, he just knows how to lie still and get fucked. Iroha Natsume also seems to like this father-in-law to fuck her. How does this story unfold after that?