while Nate enjoyed the bj she really doesn't felt that much arousal
I agree with you about that. But you have mantioned and compared only feelings of Kate in that two scenes, while for fair judgmen we have to take in count a summary of all sexy facts and kinky context details of each sex scene we compare:
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talking about feeling - That was not a photoshot for her joy or job. Kate agreed to replace a "suddenly absent" photo model, it was a one time favor, to help the company which promised her 3 times bigger payroll and for 2 guys who were nice to her, so her main aim in that scene - she had to pretend to behave
like a pro photo model, cold and professional just to make this job done, once. But we all know that just before that photo shot she drunk a bottle of
ordinary clean water (with concentrated ep1, i believe, because it was gifted to her during a car ride right from dirty hands of Santini), and while she was trying to act as cold as professional should be in front of camera - she was forced to feel lightheaded against her own will, just by ep1 effect.
That scene is not about her natural excitement. You may take is as a ep1 pure testdrive effect. Because ep1 is made for enlarging the sexual desires of a drugged person, but in that situation Kate was fighting with her feelings, she had an intention to act cold and professional in front of camera to make a good job.
While in scene when Frank came to her home - she was already excited by her own, from the moment she woke up alone and wanted to play with herself (because Luke was in jail, if i remember it right), and there were no circumstances by which she had to fight against her feelings, also she was still under slight ep1 effect. If the effect of ep1 would be slightly harder that morning - we would see not a dreaming scene with Frank, and any neighbor who'd be lucky to knock for asking of some salt or matches.
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about other parts of sexual context - in Frank scene where were just two, in safe situation of her home room, nobody else was around, nobody could come or get them caught, actually - there were no any spicy moments at all, she just wanted to have sex with anyone what's moving around and luky dude Frank was in right place in the right moment for that, nothing else hot in circumstances of that scene; while for a photo shot scene - there were much hot circumstances; just see the situation not from a female protagonist's eyes only, but imagine how hot this was looking from the sight of all 3 guys there:
+Luke was also watching it super exited by ep1 which he also drunk from Santini bottle in his car during the ride to this place;
+Todd was making shots while Kate, a sexy girl they met recently on jogging session and had too little fun with her, now she is undressing in front of him, alowing to make shots on camera, giving to a camera her seductive looks, what a sight for Todd!
+Nate couldn't belive his eyes, he thought that he'd probably never see again that cute girl from the jogging meeting in the park, and now she it here, posing naked and doing bj to him on a camera (god bless Todd's creativity mind), while he also had to pretent like a cold professional, just borrowing his dick to make a good job, all for the sake of company!
+and that was happening not in a safe room, but on a job, a public place, like anybody may come in to this room, to take or ask anything for a job routine (i hope it will happen during her next photo shots);
The conclusion is:
In summary photo shot scene have more factors of sexuality and bigger potential than Frank's sudden visit in safe home room.
But if you just love Frank and wish him a happy fucking like - i don't mind, i just hope it will be in much more kinky circumstances.