Dang, It seems my question has been answered. YES, she would have done all the naughty thing without the influence of the demonic amulet.
Okay Nina I know you're the best girl in this manga, you don't need to prove it in every chapter XD
She took the lead and stood on top of a harem MC....without any external influence other than her own love and libido. Hats off to her!
At least this MC got hard with her, there are some MCs who seem like eunuchs or sterilized lmao