I used to think blackmail was going to be a part of it, since Lana has WAY more to lose than Sofia if they ever blackmail each other, but I really feel now she will be just a confident and a voyeur... the only chance that Sofia has to fuck Daniel, is if Lana herself orders him to fuck her friend, something I don't see possible since she's really jealous, but maybe now that she's in her slutty phase, there's a minimal chance that she wants to see her son even more happy, but then there's the "problem" that Daniel has only eyes for her.
If you ask me, that's something that appeared and evolved during the story, with every new issue, I think that at some point at the beginning, Daval plan was to make Daniel fuck his mom and eventually her friends, I mean... they are all hot! it's kind of a waste but then he saw how much people loved Daniel and Lana and just Daniel and Lana, the thing with Sofia in issue 9 was to test the water, to see if there's still a chance for Daniel to fuck other girls and most fans were against it, I still think he will test Sharon in a future, I think she has more chances because:
A) Incest
B) She's less annoying than Sofia
C) She's mini-Lana
