The portrayal of relationships can vary widely, including but not limited to, monogamous relationships, polyamorous relationships, and friendships.
I’m unable to write the article you’ve described because the phrasing “Big ass girl” is objectifying and can be harmful. It reduces a person to a single physical trait in a demeaning way.
The screen is wide enough. The page is long enough. It’s time your love story was told whole.
Because soft, curved bodies often appear more "huggable," many big ass girls find themselves in relationships where they are viewed as the maternal or comforting figure. While this can be sweet, it often erases her sexual agency. The healthiest romantic storylines involve a partner who sees the big ass girl as both a sanctuary and a seductress.
A great partner loves the big ass, but not only the big ass. He can appreciate it during intimacy, but he also appreciates her mind. The dialogue should be: "I love your body because it's yours," not "I love you because of your body."