Punishment for a Stupid slut: Help me

Recently i was a stupid slut and fucked a guy without my Masters knowledge and disrespected Him greatly. i am to come up with ways in which i should be punished and am having trouble doing this. Does anyone have any suggestions as to what my punishment should be? Any suggestion would be helpful as to how to make it up to Him so that i may once again call Him my Master. Please and Thank you.