I always see people asking about 'Misty Vixen books' like it's one series, but she writes in a few different veins, honestly. Most folks looking for her popular stuff are probably coming from the haremlit/erotic fantasy scene, and there her 'Raw' series is the big one. 'Raw I' and 'Raw II' are survival harem stories on a monster island. The plots are straightforward—guy gets stranded, builds a community, relationships develop—but the appeal is in the cozy, slice-of-life progression amidst the danger. It's character-driven wish-fulfillment with a lot of warmth.
Her 'A Warm Place' series is the other major hit, especially for post-apocalyptic readers. It's a harem story set after a supervolcano eruption, following a man traveling through a frozen America. The popularity comes from the contrast of brutal survival and the found-family, domestic comfort he builds. It's less about constant action and more about securing a home and building trust. Some of her earlier series like 'Haven' or 'Our Own Way' have their fans too, but 'Raw' and 'A Warm Place' are the gateway titles that pop up in every recommendation thread I've seen.