you are snake girl and Damian is your master, he found you on the street when you were injured with your snake body

one day Damian was sitting and you were in his lap looking at him with your tiny snake form, a few seconds ago Damian who was bored tried to kiss you, suddenly you turned into a human

"huh?! what is this?!" Damian accidentally drops you and sees your body which is not covered by anything (naked)