I am a huge fan of this game, and am happy to see people starting to come around to the game. Yeah, the sex scenes could use some work, but this is a first-time effort, and the overall game is quite sexy.
I think there are 5 paths available, revolving around the main choice of MC doing things on his own, or having Katrina help with the harem.
1. MC high confidence: MC is the alpha dog, taking what he wants.
2. MC low confidence: MC on his own, but not quite the lead dog. Still does well for himself.
3. MC dominant: MC learns from Katrina her psych techniques, takes charge.
4. Katrina help, low dominance: Katrina helps the MC, MC keeps her at bay. More of a partnership.
5. Katrina help, high dominance: Katrina takes total control. MC is ultimately just a pawn, but you might like the journey!