What do you think about purposeful weight gain?

I am just like you and this is what I did-

Eat until it hurts-This means that your stomach will be growing and there may be stretch marks which is a good sign

Drink a gallon of milk everyday-Milk turns food into fat so be sure to drink a ton after a heavy meal

DO NOT excercise-You will start to get softer and your belly will get jiggly

More tips-
I would always wait until the evening to eat. When it is later in the day your body tends to not digest well and turns most of what you eat into fat. If you wait till Diner and stuff yourself, you will gain a lot. Sit in your bed to eat. I would prepare a HUGE meal at night. Make a lot of fatty, sugary, and high-calorie foods (at night) then eat them in your bed. Go to sleep right after. This is cause when I ate a lot I would barely be able to move. I would stuff myself till I felt sick, had stretch marks EVERYWHERE, and my belly was firm and bloated

Hope this helps you get fatter and fatter;)