FeedeeThroway
FeedHerMusic
This was a female weight gain story in which a woman willingly drank a serum knowing she would gain weight. She went out to a diner with the man who gave it to her, and while there she began to quickly outgrow her clothes, at one point hiding in the bathroom as she outgrew her shirt. The ending was that she would never stop growing, and she was now helpless to his advances. I think it was about 6/7 chapters or so?