This is a 3D unity game, you can browse and extract stuff with asset studio but I don't think there's many PNGs there you'd want. All the actual content is in engine.
1. Hope to optimize the toe part of the stockings
2. Oviposition value, and during the mating period, use it to tempt the MC in daily interactions.
3. During estrus, knocking on the door at night or making a surprise attack at night.