I'm not sure where are you guys getting this bullshit that luca corrupts all the girls because of his big dick, that may have only been partially the case for sandra, but she is known to be a nympho.
Laura corrution has mainly been psychological and manipulation, i dare say his big dick played a small part of it.
it was never the case that after right sex laura suddenly became a different person, Laura's betrayal amd change in behavior was thanks to the blackmail, manipulation, and Harry's lack of help and understanding.
It was the perfect setup for "I'm gonna go further and further with Luca to make Harry fall for me, but will lose myself in the process". So far it looks like it's gonna be partially the case, but those rape vibes are totally not needed. We'll see next update what this is all about
the rape is not needed is your opinion, i personally was waiting for a scene like this that felt lacking in Laura routes so far.
it might also be needed to push her for the setup you describe, in the scene before where she kiss him, she hesitated before and it seemed she chose not to go through with it, but then luca kissed her by force.