It was a mistake

SUMIRE

"I get angry, because you had his child. I can't help wishing that I slept with you when we were together, and you had a child with me too."

That would never have happened anyway. She was far too young, and she knew how much San valued his reputation. If she mistakenly got pregnant that age, they would have been both subjected to heavy criticism.

"You know it never went that far between us." Sumire mumbled as she wiped the sweat from San's neck and arms too. 

Although they did plenty of other things. Sumire exhaled deeply. Just mentioning it makes her vomit, especially since she was naive then. She knew what he was doing was weird but didn't tell anyone about it.

'I really was a fool. A fool to trust him, a fool to care about him.' Even though the regrets she had towards Sano have completely vanished now. Every single time they meet, San insists on digging out her past memories and her heart would ache.