I think the shoujo-loving sister has also stated that she's in love with him but not in front of him.
Also...we already know that Alec needs to marry all the sisters to lift the curse off so we are possibly going somewhere around this roadmap :
1. Find a problem.
2. Go on to find a soution of that problem with a sister.
3. Make her flutter and convert her feelings of affection to feelings of love.
4. Repeat above according to the number of sisters left.
5. Fight with the witch...defeat her...then wonder why the curse hasn't lifted.
6. The smarty-sister will spend a few chapters with her other sisters discussing about the prophecy of the Prince marrying of the sisters to lift the curse....some really sweet chapters of their moments together where they rejoice.
7. Consent to marriage.
8. A double spread of the marriage with the seven sisters.
This is about how it should go according to the style and substance this story follows. Add something else if you think might also take place which could be placed in this !