I was thinking, since there's already a pretty kinky and power dynamic between the MC and Gunnar, what with him "training you to be a proper bitch", it would be cool if, in the future, there was an option to get an accessory like a chastity cage that he locks you in, and you could not remove it, only he could, if you interact with him (and beg ;^) ), so he gets to decide when you can pleasure your own dick, just to add even more to the controlling and dominating aspect.
I feel like Gunnar would enjoy that kind of power, so it's not something that would be out of character for him either.