A secret between me and Kana-chan that I'll take to my grave. My best friend's girlfriend was so cute in her defenseless, makeup-free state that I impulsively slept with her that night (2025)

The doorbell rang in my small room, which is already small enough for one person.
Who could it be at this hour?
When I opened the door, a woman I knew was standing there.
Her name was Kana.
A friend from our student days, my best friend's girlfriend.
…"Let me in."
She entered the house rudely, without saying much.
It seemed she had left home after a fight with him. She changed into her loungewear, and we had some cheap liquor and instant ramen.
"It's like we were students again. Thanks for listening to me." A
slightly tipsy Kana leaned against me.
Her slender shoulders, her defenseless cleavage, made me intensely aware of her as a woman.