This is a hunch, but I think the one who asked Arez to rewind time and restore Kiera's memory is Kiera's father. Because he also had the same nightmare the night Kiera went back in time, and we already know that Arez did it on someone else's order.
Btw about your sexuality, maybe you can be attracted to both ;) Also there's that one thing called romantic and sexual attraction. You might always be sexually attracted to both but romantically lesbian which probably exist ad the heart and body is two different things
