
Spoiler, might be slightly off since I haven't read the novel in years.
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Leah will live happily with Ishakan for a while, but then the empress got to them somehow and Ishakan was 'dead', they brought Leah back to the empire, where the prince had already married someone but he still wanted Leah, they made Leah loses her memories (I forgot from here), but Ishakan was still alive and got her back

Spoilers---
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No, there won't be. But if I remember correctly he (the brother) will let her watch while he's doing it with someone else. It's been a while since I read this but I remember they manipulated her memories so she'll think that all the memories she had of Ishakan were memories of her and her brother. Basically, replacing Ishakan in all of her memories. But she couldn't feel the same feeling she had from those memories and was a bit doubtful so she couldn't or didn't want to get intimate with the piece of trash brother.
I hope I remembered ot correctly.
chat i've been letting this marinate to the point where she's finally at least away from that toxic family and kingdom is she bc i really wanna read it