Viconia's romance is pretty full of landmines - I know of at least 3 instances where it's possible to break the romance without meaning to.
The full romance ends about 2 talks after she gets attacked (event) by a yochlol and a priestess of Lolth, then she decides that it's too dangerous for both of you and breaks it off. She tries to leave the party but saying the right thing will let her stay, though she breaks it off either way. This is the ending of the romance for SoA.
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