Punishments/bribes

For cumming without permission, I'm a fan of forced stimulation. Everyone's different, but you could have fun coming up with a rule--each time you cum without permission, your dom will afterward stimulate you nonstop until you cum three times, no matter how sensitive you get. Or stimulation with a vibrator set on an EXTREMELY high setting--many girls can't cum if the vibration is too intense.

I don't have any suggestions for bribes, but I'll think on it...

My punishment for cumming without permission will be to detail my b/f's truck once a week for three months.

As far as bribes--if anyone comes up with any that might work, please let me know.
I'm going crazy!!!

To my experience all men like to get their cock sucked. If you are into it you might also offer to take the semen.
Well, but how bribe someone who per definitionem might make you do anything he likes? Firstly this is never completely true in reality and secondly - choose something you really don't like and alsways refused or fought against.
Thirdly you may try to give him Bambis-eyes, but I am not certain wether this would work