"Wrong answer. Carroll has been very nice to me, and to other people I like." With that, Lizzy starts eating Lilian.

As you had expected, Lizzy may be over the worst of her vore problems, but she still can only swallow slowly and small by the standards of most vore. This gives Lilian lots of time to express her displeasure with the whole thing, which she does in most unladylike language. Presumably she would be able to free herself, but the ropes you have on her are quite sufficient to keep her helpless.

Eventually, Lizzy has her head past her lips and the room is pleasantly silent. This allows you to give Lizzy encouragement and advice. The encouragement is not needed. Lizzy is finding Lilian a very nice meal and is putting her heart into consuming the lass.
The advice is another matter. Even if Lilian was not making what resistance she can, Lizzy would be hard put to get her shoulders inside. With her jerking around, it may be beyond her. However, you have a few tricks to help out. You reach back and suddenly goose Lilian. She goes stiff for a moment and that is all Lizzy needs to get past the shoulders.
Lilian resumes her struggling, but she is worse off now. Still, there are some hard moments ahead for Lizzy, particularly getting those shoulders into her throat. To help out, you reach under Lilian and start massaging her breasts, an attack she both welcomes and objects to. Vore is closely related to sex and Lilian can not fully object to your attentions no matter how hard she tries.
Once again the distraction allows Lizzy to advance and you feel her lips on the upper parts of Lilian's trophies. "Good, now start licking them."
Lizzy looks a bit shocked and questioning at you. "You are getting some delicious food, so you give her a chance to get off. Fair's fair. Besides, it makes her less able to resist and improves her taste. So it's a two-fer for you."

Lizzy accepts your greater experience, tho possibly she suspects that you are getting off on watching her play with Lilian. In any case, her tongue gets to work and Lilian is twitching for a different reason now.

As Lizzy starts to engulf Lilian's boobs, and play with them more, you let go of Lilian and get off her and the bed. As you figured, she is no longer able to struggle enough to stop Lizzy. So you move to the foot of the bed, where Lilian's legs are tied and where her lovely hips are so inviting.
Why shouldn't you have some fun too?