Rape, there's quite a bit but NTR, not so much, unless you're someone who considers all rape NTR then yea, sure.

So far, I've only had one harem scene where the girl had sex with some other guy while 'you' watch the two and it wasn't even rape, she did it consensually. Which was with Zephyrus.

Honestly rather have that than some weak foot/shoejob scene like Arthur. For a legendary, you'd expect her to do something more great, her scene was weak even in the SM scale.