ALDN-544 - My brother's wife (lol) Or should I say it's only for me during the day lol Narimiya Iroha

Iroha has been married for 5 years. Although she was not blessed with children, she felt happy in her married life with a serious husband. However, Iroha's married life changed completely when her husband's younger brother moved in. My younger brother, who was a lot older than me, was a NEET, unable to find a job because he was still young. When her husband goes to work, he approaches Iroha and plays a prank on her. If he refused, he would make strange noises and go wild. Iroha worries every day because she can't even talk to her husband about it. However, Iroha decides to face his brother-in-law, thinking that things will continue as they are. What is the outcome...