[_Edge]

I think she should tie you up and blindfold you some time. I think a spreadeagle would work nicely. (Obviously i dont know if you are into bondage)
She can then play with your cock as she likes and edge you herself to make you horny. You need to stop her obvioisly if you are close to cumming.
She can also sit on your face and make you eat her to as many orgasms as she wants
She is in controll, so she says when its time you get freed.

I know its quite hard being denied and edged, so I guess you are pretty horny all the time.
For the time you are not with your girlfriend (work, etc.) and you catch yourself locking at another girls butt, boobs, etc. you know what I mean, you should write it down (in your phone). Do the same if your cock gets hard.
At the end of the day/week you need to show it to your girlfriend and she can punish you as she likes for that.
You 2 can decide the punishments before or you let her get creative.
Maybe spanks or more edges.