I don't think that there will be much more than Sharon being pissed at coming home or waking up or whatever, and the 3 of them are gone.
As for the more rugged way. Sharon is already pissed about you giving her ex to Calisto. I think if she finds out that you slurp her down like a bloody milkshake she will be pretty pissed. As for consequences.....
I think it is like the MC says. Sharon knows what the right answer is, but is physically incapable of pulling that trigger.
MC is doing her a favor.
It should work out fine as long as we do not try and have a merry moresome with Sharon, Laurie, Calisto and the MC all feasting on Astrid. While I personally would find that delightful, and some others would throw a snit fit, I think we are safe in saying that the blood feast will be for a table of two with Astrid the only menu item.
Peace