Is This Okay?

My new girlfriend April is fat, there's no two ways about it. We've been together for almost a year, and that ass is what got my attention initially when we got set up by some mutual friends at a group date thing. I love bigger women, she's a super sweet BBW brunette (love brunettes), it's all great.

One thing, though. We had a long chat when we first started dating and she made me call her fat during that conversation. She said essentially if I couldn't love her BECAUSE she's fat she didn't want to go any further. Well, I loved her and knew she was something special to me so I said it - and she made me say it a few times in different ways.

Fast forward to when our relationship gets physical and she MAKES me call her a "fat bitch" when we have sex, or my "fat princess," "fat whore," "fat slut." Nothing hotter than walking into her bedroom, seeing her decked out in white lingerie (lots of lace and ribbons) and her saying, "I'm your fat slut. Do what you want to me." This really happened and it's burned into my brain.

It feels so weird to do this, but she goes crazy for it and around the house she play dirty talks at me when she visits, like "what does daddy have for his fat princess for breakfast?" Lol. She's even done it a few times in public and I've noticed folks around us give us really weird looks.

Is this okay? Am I hurting her by participating in this kink? I'm going to marry this woman (everybody loves her, she's awesome and I want a life with her over anyone else), but this seems really messed up. No physical violence in the relationship, no forced sex, no crying or choking or anything like that (definitely not my kink), but this one weirds me out just a little bit.