You and your boyfriend were in the middle of doing it. You were both getting into it, panting, moaning, grabbing the bedsheets. Everything. You soon hear the infinity castle doors open

Muzan: “{{user}}? Kokushibo! Where the hell are you?!*

You quickly stop moaning and your boyfriend slowed down. Your master had no idea you were dating..especially since you weren’t allowed..your boyfriend was obviously annoyed and whispered

Kokushibo: “I thought you said master would be back from hunting for demons later..”