Not really humiliation, but your girlfriend could guide you through a session of masturbation, and by altering your stroke style and pattern, make it nearly impossible for you to come.
For starters, I have found a 10 (fast ) - 3 (slow) - 5 (fast) - 15 (slow) stroke pattern is a tough one to bust with. Of course, she may have to adjust the pattern until she's in control of your level of arousal, which should stay around 8, on a scale of 1 (soft)-10(point of no return).
- The session should last at least 20-30 min.
- Use lube.
- Ice or a towel dipped in iced water around the balls can be a nice addition.
- Your cock should be stiff, full/heavy, slightly uncomfortable (you should feel like you have to touch it) and look like a beacon before she allows you to cum
Also, tell her to watch porn and take note of the different ways men stroke their cocks - she should be able to guide you in at least 10 (bare minimum) different strokes.
Before I allow him (an ex, not my BF) to cum, I always close with a question like, "do I own your penis?" or "are you my bitch?". Just to further assert my dominance. :09: Which she does not have to do, I just have a natural inclination to tease and take control. :08: