And I get a strong feeling Denise is a pervert waiting to break out.
A girl's first true love is her Papi. All the intimate touching is just arousing the other natural feelings that come with intimate touching. That, and the setup with the museum exhibit and the painting of Lot and his daughters (and the surrounding story) make it "ok" for her to feel that way about Papi. The story is very artfully leading one down Denise's path of sexual awakening and her convincing herself that it is ok to feel that way about Papi, given the story of Lot and his daughters
is biblical and all. Just sayin'.
What is not as typical is this level of storytelling in a porn VN. NaughtyRoad has some mad story-telilng skills, and should be using them also IRL. They probably would make a really good living writing professionally.
Denise Macy is already clearly in love with Papi, which is part of the reason for the serious tension between the two of them. I think she is terrified that if she acts on her feelings that Papi will reject her, or that she will harm the family (along with the truckload of guilt she is carrying for being "responsible" for her mother's death). I think part of her holding Papi at arms length is her inner belief that she doesn't deserve to be happy with him.