Smell command is OP. You can gain pleasure+lowers discomfort+you can do other actions. The girl seems to have 3 phases of alertness.
I think you could actually get her 100% pleasure(do whatever you want with her) by day 10. I got it on day 13. The sensitivity isn't the thing you should care too much about, it's about how quickly you can raise the pleasure score, and lower the discomfort bar. Spend the first couple days just smelling her, then wait for the pleasure+ discomfort- part of the smell command to kick in. Once you have that set-up you can touch her tits or ass(when the discomfort bar shoots up, just move farther a couple times wait til it looks like she is ignoring you, then restart the smell cycling again.) I messed up a few times early, and got caught 8 times, but managed to fuck her on day 13. So I'm guessing you could do it earlier using the smell command+groping.