Feel free to humiliate your boy for cumming so soon. Now tell him you'll try it again in one week.
Same scenario (don't worry it will work again).
Now tell him he has become a Premature Ejaculator and you weren't expecting it. Leave him attached to the bed and tell him that you always his dick was small but that this is a new record.
Leave him a few moments alone. Then when you come back, tell him
"Ok now you can no longer please any woman. So we have to make a new pact. You do whatever you are told too; and for myself I don't broke up with you and trust me with that tiny premature thingy you wont find anyone else."
"So thank me! For now on you say thank you Miss .... ."
When he seems to cooperate you can untie him.