Now it's more clear than ever than Daniel wants his mom and only his mom (and maybe, just maybe, Sharon in a future), now the only way Daniel could fuck Sofia is if Lana wants it and I doubt she wants that, because even if she's "sluttier" now, she's only for her son and she's extremely jealous.
Sofia role may turn into an adviser, since Lana said many times that she only had Daniel to talk about her problems, also I see Sofia turning into a voyeur character, encouraging Daniel and Lana because she thinks it's hot.