>>6070949Preferred way: Deus Ex Machina and now you're stronger than her and can manhandle her tiny body like it was meant to be handled from the day she was born, then fuck her on every surface imaginable.
Hard mode way: Like other anons have mentioned if you want to make it more believable, think of things that a nationalistic Oni would find important as part of her culture and why she's racist to begin with. Basically why would she stereotype (you) - and then write situations where you break the stereotype, making her question her preconceived notions to create an internal conflict in her so that over time she stops filtering you through the stereotype and seeing you as a person with individual qualities that she actually appreciates.