Jaheira & Viconia Romance in same playthrough

[LegendKiller]

alright, so I recruited Viconia very late in the second chapter, after I have already done a huge chunk of available quests in chapter 2, so that I could get all of the companion quests of those I did not want in my final party over with. I am now doing Dorns quests and have already progressed Jaheira's romance to the 2nd encounter with Derwin, so her and the protagonist will be spending the night together VERY soon. Viconia has also been having regular love talks with the protagonist, and she and Jaheira have not had any conflicts that have forced me to choose one. What will happen if I finish Jaheira's first, and then I am able to finish Viconia's all the way through? will Viconia's be the one that transfers into throne of bhaal, or will they both? this is unmodded by the way, and I'm not doing anything like purposely keeping them apart to keep the conflict from happening. Any input on this will be appreciated.

[Tasi]

There will be pint where you will have to choose. You cannot finish one without blocking the other.

[LegendKiller]

*SPOILERS* Yup, just found this out first hand but thanks for the input. It surprised how long it took, that's why it threw me off. My first playthrough it made the "choice" dialogue pop up before any serious flirtation even could happen with Viconia, around the part where she tells you about her revenge against the people that buried her alive. This playthrough, it got all the way past the marriage talk and Underdark stuff, bordering very close with spending the night together. I had to go with Jaheira because this will be my first time playing throne of bhaal, and I feel like hers seems like it will be the best one to take to the end. Viconia just breaks up with you in SoA, so I have no idea how a broken relationship is supposed to have any satisfying conclusion in ToB, but i'd rather go with the safer option for my first time.

[Tasi]

All romances continues in ToB.
Viconia romance spoiler:
Depending on the responses you have picked Viconia may even change her alignment from Evil to Neutral