I don't agree with that quite yet, but I will say that if there is not a sex scene with the mom in the next episode it will be like he's dragging it out.
Yes and no. This episode did a good job in showing the difference between "being done to" and "doing unto others". A BJ is still a major step, even with the TJ and HJ's before, and even with the MC having 'helped' mom orally last episode. Now some may mention that she did more than a BJ when she did her bed gymnastics last episode, but that was when the MC was asleep. It's much different when he's awake as an active, verbal, participant and I think the mom's thoughts show that.
She still seems at least a little conflicted, especially now that she has shared the plight of the dad. I think if the next episode had her coming to grips with things more and offering a BJ (or anything other than full sex) on her own, that would be a good story progression. I get that some love the idea of the MC being the corrupting factor and 'forcing' things more, but I think mom agreeing to it and instigating would clear a lot of hurdles later for anything else that was to be done in the next 3-5 episodes.