You technically can romance them both vanilla, I have no mod touching relationships, that if you do it depends on you, I feel fine with it because my character is poly (she is half animal- satyr race). I also had night with Halsin and drow siblings recently(Karl-ach didnt wanted to join).
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My Benedict bard, High elf spurned everyone for Gale's sake.
My tiefling paladin same, when romancing Wyll.
(Those two men are 100% monogamous.^^)
But my Archfey Warlock, she ended up with a non ascended Astarion and Halsin at the same time with no drama. :D
I was just wondering how far that works with Karl/Karlach if you romance her/him. Thanks. :)