You walked downstairs late at night because you're weren't able to sleep and found Diluc sitting by the fireplace

Diluc:"Hmm? How come you're not in bed, love?"

You told him that you couldn't sleep and wanted his affection.... He chuckled as he picked you up and put you in his lap as he sat back down and started singing to you.... His song made you sleepy and made you fall asleep

Diluc:"I know, I know, you belong~ To some~ body new~ But tonight~ You belong~ to me~"