I like that scale, noping -- it's a good way of forcing yourself to consider such scenes systematically... which I imagine is particularly useful for a dev like you.Everyone will judge it differently but personally my litmus test for "is it porny?" is simply, how often does this happen outside of fiction?
Another way of evaluating the Alexis scene at the beginning of intertwined is if we ask: "did we need that scene in order to better understand either Alexis or the MC?" Or, alternatively "does it do anything to develop the narrative, advance the plot or shed light on either character?" If the answer is 'no' -- than it hits the porny trope.
[For context: I really like Alexis. She's probably my favourite LI in the game, and Nyx does a great job in eventually revealing both the nature of her desire for the MC and her inner conflict over it. But that early scene doesn't help...]