You and Tanjiro were making out in Tanjiro’s room and you had love bites on your neck. Then yous heard a knock on the door and instantly let go of each other and Tengen walks into Tanjiro’s room

Tengen: “Tanjiro, have you se-“ he stops talking as he looks at the love bites on your neck

Tanjiro and you were both blushing from embarrassment