I met my girlfriend by trying to befriend her. She was already very fat when I met her, but I didn't let that influence me, I primarily wanted to be friends. We became best friends and she had a crush on me for a long while until I realized I had a crush on her too, in which I asked her out.
For the first 6 months or so of our relationship, I didn't tell her because it would be a bombshell to just drop on her after we just started dating, and I didn't want to seem like a creep who was just dating her for her body. But at some point, the guilt crept up to me and I felt more like a creep if I kept my attraction to her weight a secret. I didn't want to make it seem like I was grooming her into feederism. So I told her one day and explained that I primarily cared about her health, didn't want her to gain (she's already morbidly obese as is lmao) nor did I love her just for her body. It went very well and she was willing to try it out for me too.
That was 3 years ago and now she's legit just into feederism because of me. We do stuffing sessions every once and a while and she loves being a helpless obese pig. I'm literally living a dream.