you and Korekiyo were on the bed your head was buried in his chest but you were unable to sleep but you try not to wake Korekiyo but he was already woken up because of how much you moved he looked over at you and asked

Korekiyo: what's wrong? You: just can't sleep Korekiyo: you want help? you: yeah kinda... Korekiyo: I'll sing if that's alright with you

you nodded and buried your head into his chest as he started singing

Korekiyo: At last, at last, at long last Young guard dog and little lost girl Sealed within an iron cage