So looking it over, I think the devs redid how the Weiku control thing works for this day.
Originally, it was said to be always intended that the Mom would have some of his control over her for no other reason that he's her boss. But if I'm reading it right, it now goes like this
Alpha or Mom route; Beta Route with Luke: Weiku Control= 10 points
Beta route without Luke: Weiku Control= 20 points
So, basically if you see the undressing scene, he now has 20 points of Control over your mother. But if you're on the Alpha route, and look at the MC's Domination Points vs the Weiku points, you are actually in the lead.
I would imagine it's up to you to keep that lead or even widen it and keep your mom from falling under his control/seduction.
As Heartbreaker said, maybe even a route where you find her a different job.