Anna's submission to the penguin is simple, it reminds her of her deceased domineering father. And it's up to us whether he will be replaced by a penguin or not. Anna sees her deceased, domineering father in her old grandparents.
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I think using the old "DADDY ISSUES" trope might not work so well to get Anna aroused. But daddy issues would impart solve a plot point of dominance and submission.
I wasn't sure just what the whole story was missing because Mr. Palmer to my knowledge hasn't touched on the topic of 'corruption' being part of the story. But I think there are hidden under tones of corruption I hadn't thought of--but if you look closely there it is in the story.
Corruption
1) Anna held Chris at arm's length till she discovered how exciting it was to show off her body. I always had put Anna's actions in sharing pictures with Chris as a need for self-validation that she was attractive. Now she is getting aroused doing it and seeing it. Still Chris is rather the unavoidable route so far.
2) Jake and Marcel, it seems (if you play those routes) makes Anna feel aroused that young attractive men are interested in her.
3) Its where Marvin comes in that I totally have missed Anna's corruption. With Marvin it's always been a hard no even if you click for Anna to allow Marvin to get away with his perversions. It has nothing to do with Anna being into old men, but her having power over Marvin and Anna gets her kicks having power over Marvin. And it goes back to David too of Anna having power over a man. David is as I said before a simp where Anna grew up in a world of dominate men.
4) It gets complicated with Grant when it comes to corruption because we haven't seen enough to establish just on what footing Anna and Grant's relationship sits on. Other then it was a secret relationship to go behind her father's back as some kind of rebellion against her father's tyranny. But if Anna was willing to sleep with Grant when she was in college...
where there is smoke...
5) Still see the whole Hank route as straight up power play but see how Anna could get corrupted as their relationship would continue.
6) Anna's body and urges are the unintended consequences that of her own corruption. How and why, that is still needs to be explained as the story goes on, but we see it with each of Anna's adventures. I've deliberately ignored the Robinson route but within its Anna's own body that betrays her. Anna parts her legs when Marvin and she are at the booth at the bar. Chris had an effect on Anna when he grabbed her ass...etc...