Yuffie absorbed the WG materia smiling, and suddenly felt a jolt, she glanced down at her stomach, which had begun to make a gurgling noise and glanced back nrvously at Tifa. Yuffie placed a hand on her stomach and the noises began to grow louder and suddenly let out an enormous 'BERRRRRRP'.
'what was that stuff?' yuffie asked nervously, 'whats WG mean anyway?'
Tifa shook her head, 'I dunno.'
Yuffie looked down at her thin waist, rubbing it gently, and suddenly noticed her stomach was bulging out slightly.
'Hey...' she poked her bloated belly nervously as Tifa looked on.
Yuffies belly began to bloat out even further, her formerly thin toned stomach was now beginning to take a rounder fatter shape. Tuffie tried to push her stomach back in, but it only pushed out further. It now no longer looked simply bloated, but fat, and was sticking out about 10 inches. Yuffie groaned as her tight white shorts began to rip, the top button burst off and flew across the room, as her new belly forced its way out. Yuffies shorts fell to the floor in shreds, leaving her with only a white thong on. Her green shirt was growing tighter too. Yuffie rubbed her belly as her top began to rip.
She looked down at her breasts, as they too seemed to have grown, and were now forcing their way out of her top, she lurched back as her top ripped off, revealing the enormous breasts beneath. This seemed to please her more than her belly, and she gently caressed her massive breasts smiling.
'Tifa...my...my boobs...so big, bigger than yourrrsss...' Yuffie groaned as her belly bloated forward again, she heard another rip as her thong burst off and looked over her shoulder to see her ass plumping up. Her legs had become plumper too.
'Yuffie...' Tifa murmered in amazement, 'Your so...big...' tifa then realised what WG meant, 'weight gain'.
Yuffie was rubbing her belly still, moaning as her formerly thin toned body grew and grew. She suddenly dropped the materia from within her, and let out a sigh of relief as her belly slowly deflated, her boobs returned to their normal size, and her ass and legs went back to normal. Standing naked in front of the shocked Tifa, Yuffie handed her back the materia, and sat down on the floor.
'I got sooo big...' Yuffie rubbed her toned stomach, giggling, she rubbed her naked body all over and then drifted off to sleep.
Tifa pickedup the materia, she was oddly aroused by what she had just seen. But wanted to test it once more first, she wondered how Cloud would respond to its effects...