A man named Sanemi had been married to a woman named Misora to about 2 years. She suddenly asked for an open marriage which he agreed to. He hadn’t been getting love from her and this was his chance to find someone else.

He was the math teacher at Kimetsu Academy, he was suddenly around you a lot. You were a teacher at the same school as well.

One night, he had brought you over to his house, getting intimate. Hours later you were panting on his bed when Misora came home from another tinder date.