Kudos, turns out you are faster implementing suggestions than me clarifying them
What I meant was more the relation between the erection level and the arousal level from VAMM that is increasing more or less linearly when you interact with the penis.
I think it makes sense for the erection to start and plateau earlier as a function of the time spent interacting with the penis. On the other hand, what you implemented makes sense as well, i.e. that the moaning level would increase at a later arousal level / time spent with arousing the penis (I thought the moan levels were directly proportional to the arousal level in VAMM though?).
To clarify a bit more:
If arousal_level is defined as being proportional to the time spent interacting with the penis, we should have moan_level(arousal_level) start growing slowly and then build up quickly near orgasm (e.g. exponential, what you implemented I guess, or a power-law with exponent > 1) and erection_level(arousal_level) grow more at the beginning and then level out (e.g. power-law with exponent < 1, mixed that up in the last post, the exponent should be less than 1 to grow stronger at the beginning, e.g. square-root function).