A little story....
I met a girl back in college. Banged her after the first two hours of knowing her. She was very sweet, pretty face, but a chubster.
Never girlfriended her up, though she was WAY into me. Probably banged her about 3 times in two years back then.
The first time was just because I was horny and she was clearly coming on to me and, well, why not.
And, the sex was pretty good. She was a fun horn dog.
Yadda, yadda, the years go by, don't see her for over a decade and etc.
Ran into her in the spring. Had drinks, banged it out again. She still struggles with her weight. But, she eats right, exercises, but just can't seem to drop it.
And, she's really a great girl. Sweet. Cute. Fun. Knows the kind of guy I am and still willing to bang. But, it stops after a while because I just show no interest in dating her on the regular.
Why? Because I know the social outings and sex will be fun, I can't see myself getting horny for her for too long. She's fun to be with her and there because she's pleasant, likes me, and guys like variation. But, I can't get beyond her size. I know she'll get freaky and give me easy sex and if she could slim up, she'd be a hottie without attitude.
So, have your fun, but just know your boner for her has a half-life. You are just gonna be able to see yourself hitting it for too long.
Chubsters, outsider their personalities, are "okay" for drought busting, but not really all that good for regular FBs because, well, no matter how kinky she is, those fat folds just get in your head after a while.
Have your fun, chase other plates, put no effort into pursuing her for even sex. Let her do the work.
In the meantime, work on yourself, spin other plates, and so on.
Some guys will criticize you for nailing cubsters, but as long as it's just a side piece for a once-in-a-while nut buster, go for it. But don't see it as anything more than that. And once you get better plates in the rotation, you'll eventually drop her.
And once you improve your SMV, such issues won't really be a problem.