Ah, so you want the female Sole Survivor to gain weight, hmm? That's fine. After all, weight gain is a classic form of body expansion. Now then, how exactly does she pack on the pounds? Here are a few ideas:
Story 1: The Pink Paste
While exploring the Commonwealth for the Brotherhood of Steel, The Sole Survivor (possibly one of her companions) came across the Suffolk County Charter School, which has been long abandoned since the bombs fell during the Great War. However, while carefully searching through the now derelict academic facility, she comes across numerous Feral Ghouls. Though, these Ghouls had a pinkish hue and were considered to be morbidly obese. Eventually, she comes across trays full of this pink paste. Though, little did she know, that tasting this paste administers an... Addictive and filling side effect. Will she realize her mistake before she becomes too fat and rotund to even waddle?
Story 2: The Case of Vault 99
When The Sole Survivor had returned from being teleported to the Institute, she paid the Synth detective, Nick Valentine, a visit. But when she visited the Valentine Detective Agency in Diamond City, he and his assistant, Ellie Perkins, were currently reviewing a brand new case that they've recently acquired from a wealthy client in the Upper Stands. Apparently, said client wanted Nick to find the man's daughter, who ran off with some Vault Dweller from a previously unknown Vault: Vault 99. Of course, being the helpful person that she was, The Sole Survivor decided to help Nick Valentine with the case. However, little did they know, that this specific Vault had some... Eccentric tastes when it comes to their views on what a beautiful woman looks like. More specifically, the rotund and morbidly obese kind. What will happen when The Sole Survivor comes across this eccentric Vault full of fat and obese women?
Now then, which story will you choose?