I have an idea for a weight gain comic which is about a succubus whose going along normally with her tasks of getting more people to fall in love with her until she finds someone who her spells dont work on because he likes fat girls.
(She can only make people fall in love with her only if she realizes what there fetish is which so far has been easy because it was just people who like tits and ass, but with the guy who likes fat girls it doesnt work because she hasnt found out)
She disquises herself as a normal girl and starts dating him to find more about him and his fetish. She would keep dating him overtime she would actually show interest in him and get fatter from her bf feeding her more and more food which would slowly give her hints to his fetish. She then realizes his fetish, but instead of revealing herself who she really is she gives an excuse and says she needs to find "a more specific result" which is actually an excuse because she is slowly starting to like her fattening body and wants to grow a bit more.
Time would pass with her getting more addicted to food and fatter until she becomes immobile and wakes up from her trance remembering who she really is. She reveals her true identity to her bf knowing it would end their relationship for hiding this secret, but the boyfriend actually knew since the beggining because at night her disguise would deactivate and that hes happy she met her. She would start crying and apologizing, but the boyfriend confronts her saying everything is ok and kissing her. More time would pass and it would show the succubus growing bigger and faster with the final shot showing her being bigger than the whole room.