Too bad this whole thing is making me look down on the author. It would be one thing if Paul's crime was basically managing to cajole Lilia into an illicit sexual relationship, which would damage her reputation and prospects in life. It's another thing if it's pure physical rape. Not from Paul's pov, he's a scumbag either way, but from Lilia's. Like Mfauli already said, this basically means she's indeed now one of those unrealistic ero-manga women who's raped until she mysterious starts liking it and falls for the faceless rapist.

There are all sorts of broken people even in RL, even women who voluntarily travelled from Western countries to become "wives" for the animals working for Isis, but was it really necessary to make Lilia mental like that? Especially when she otherwise doesn't display deranged behavior (she's even disgusted by Rudy's lecherous looks, yet at the same time she fell for a man who raped her, huh? Huh?). When you look at how she is, you'd think she actually accepted Paul's approach, against her better judgement (made a mistake, like it's called), had to suffer because of it, but still can't forget Paul and thus decided to stay close to him by working in the same adventuring party and then as a maid for his household. Didn't she work in the same party? I seem to recall something like that. This sort of scenario would be perfectly realistic also in RL.

Author is what he is, but perhaps the LN editor (if such a thing exists) should have said something about it. The anime director might have also wanted to spend 20 seconds to think about it.