It's called a design choice. The moment you can go all the way with Amelie the game is over because she's the hottest LI and nobody can top her. *I* don't have a problem with that as long as her teasing is this good and the other LIs fill the gap. I don't necessarily love the concept, but it is what it is.
Yes, I know exactly what these "teasings" are like in games... The biggest problem here is that these teasings have been around for a long time and are one-way... But it would be much more interesting, and I would accept this better, if it were designed so that MC could tease Amelie too. Let the woman "suffer" and yearn for the big dick. But here you only see MC running after the pussy like a horny pervert with a teenage brain that he doesn't get... And he's happy about a blowjob like it's Christmas... And this madness can end badly. If Amelie thought like a sane adult, she could see this in advance. If she played this game with MC for a long time, the guy would make some huge mistake, and then they would both be in big trouble. What's the solution? Either she gives the pussy to MC, and then the guy will calm down a bit, or she will close the pussy door permanently and end this game. In the latter case, MC will cry a little, but there are still three girls who can console him...
But the problem with this is that these require common sense thinking, which is not the case in porn games... So we get what the makers give us...