remember people unless Sophia sends Dylan to boarding school she still as a meeting with bennet about his grade and she has a choise to sleep with him or not. which she may no like his ego but I think she inrested in seeing what he packing after having her barefoot on it and did excite her so she may have foot fetish
She gets "aroused", not excited, and only if she doesn't have sex with Liam day 16 (so this may be another route dependant on it). But Sophia gets aroused if she's not wearing a bra and there's a slight breeze, like in class earlier that day.
Plus you're referencing a scene that ends with:
s "Are you nuts?! That's completely out of the question!!!"
s "Not on any terms would I ever have sex with you!!!"
...
s "There's nothing to mull over or decide!"
s "That's just baseless impertinence!"
s "I really don't know what your problem is, but I'll bet it's hard to pronounce!"