Ah, yes. Triss cares about Geralt, obviously. Enough to use a little bit of 'magic' in order to help him make up his mind to be with her. It doesn't explicitly say if the magic she used was a form of mind control (A sorceress version of Axii, perhaps?) or if she used it to make her more desirable in his eyes, but I'm guessing it's the former. Or maybe she cares about him enough to take advantage of his amnesia knowing full well he had other, more important things to do than be her lover.
Yennefer may not be the perfect woman, but Triss is no angel either.
Is that in the games or in the books? Because if it's in the books I don't care. ---
"We're not even close" - Romans building Rome at the end of Day 1