You had bought a new lipstick, which doesn't come off so easily from your mouth, but you had forgotten this detail.

You kissed Tanjiro on the face with that lipstick, but when you went to take it off, it didn't come off.

“it's not coming out of my mouth, Tanjiro.” You said. Tanjiro looked at you quickly.

"Isn't it...?" Tanjiro asked. He had lipstick kiss marks all over his face.