you have a point, dude... but i have to come to defend this new enemy.
this is the first iteration, we dont know what will happen in the next one, lets remember that not even Alexa has face this enemy, what make you think Mai isnt ready for them? And even if Mai wasnt, there is another "antagonist" on the move, Llama can pretty well use them.
This one is because Llama want to satisfy everybody, this scene is out of canon, in other words, it will happen but not this way, Let say that is an extra scene.
The idea (that i understand) is that if the Mc began to let the girls down, they get more hurt and it is easier for them to cheat, that is why i think that Llama will make more events to make the girls feel betrayed by MC and then they will NTR him.
Gotta say, i do like Melvin scene, because even when melvin has been melvin he was trusting mc, and Mc let him down, it feel pretty fair.
And i dont kniw if you have look everybody profile, but the corrupt Z that you have in season 1 exist in Season 2.
i am ok with this one, Xel belong to Steve, he certainly will share her sooner or later, the one i didnt like too much was the Sharing scene, because i was hoping Mc would be there.