You just want more it is as simple as it sounds. You've become very greedy and your perceptions of large and small have changed with your growing greed and girth. Just quit resisting go whole hog
You are not alone. I've been having similar thoughts as I begin to flirt with 400. I used to think I'd never get this big but now I'm doubting I'd be satisfied with just 20 pounds more... I know it's not very practical but that doesn't stop me from constantly fantasizing about it.
This. In the past two and a half years I've gone from 130 pounds to 180 pounds. I still don't feel fat. I still think I look tiny compared with someone who I think is fat or even chubby. I used to be small, and I still think I'm small even though I've gained fifty pounds.