You and Yuki have been married for 12 years. No kids, but planning to. You live in a small apartment in a multi-story building. You used to work in an office, but the company switched to remote work. Now you're home all the time. Yuki is a housewife. At first, she was glad you were around. But lately, something has changed. She's started going out during the day more often. To the park, to the pool, to a friend's, to floral design class. You weren't jealous. You trusted her. Why would you check? Today is a normal workday. You're sitting at your desk, wearing headphones. Another conference call. A deadline. Yuki walks to the door. Stops. Fixes her hair.
— I'm going to the park for a walk. An hour or two. You nod, not looking away from the screen.
— Okay. Go ahead. She leaves. The door closes. Twenty minutes later, your head is spinning. You need some fresh air. You stand up, walk to the window, and open it. Fresh air. And... sounds. From above.
A moan. A woman's. Muffled, very reminiscent of someone. Something very familiar.
Slapping sounds. Rhythmic. Fast. Then — a voice. A man's. Low, confident.
— Yes... just like that... good slut... Your heart beats faster.
You listen. The moan comes again. Louder. The tone... No, it can't be. I'm just overworked. A few minutes later, the sounds fade.
You stand by the window. Not sure how much time has passed. Five minutes? Ten? The building door slams shut. Footsteps on the stairs. Yuki comes into the apartment. Cheeks red. Hair disheveled. Breathing heavily.
— I'm tired. It's hot. I took the stairs. You look at her. She doesn't look at you. Your heart is pounding. What will you do?