Be Grateful! (TG, TF) FULL STORY

You were eating dinner when your girlfriend started shifting around in her seat. "What's wrong babe?" you asked her. "I just can't seemed to get comfortable in my seat with my fat ass." she said in a whiny voice. "I'd consider myself lucky if I was you, you have a really nice butt. Other women would be grateful for that" you said to her. This clearly annoyed her but she brushed it off. After dinner she stood up and started washing the dishes, and when bent over to put them in the washer you gave her ass a smack. You were in awe at it's recoil. She screamed, "WHAT THE HELL?" at you. "I'm sorry I just couldn't resist babe." you said chuckling to yourself. "THAT'S IT! I tried so hard not to do this, but I can't take it anymore!" she screamed. You were about to tell her to calm down when she backed her fat ass right into your crotch. At first you felt lucky, until your realized something was missing in-between your legs.
    "Wh-what... where'd it go?!" you yelled in confusion. "Oh that's just the beginning." she laughed. She started grinding on you and you felt stuck to her like a magnet. As she kept shaking your her started growing out and turned a platinum blonde. You started touching it in shock and it felt so silky. Instinctually you grabbed a hair tie off your wrist and put it in a pony tail... since when did you have hair ties on your wrist? Before you could think about it much longer your face started shifting. You made fish lips against your will as your lips swelled. Your lashes grew out and your eyebrows thinned. A coat of makeup appeared upon your face. Your vision started to get a little blurry so you took your glasses from the top of your head a put them on.... wait you never had glasses did you? As you were distracted by your new glasses your chest started inflating causing your to lean forward and fall on your girlfriend. The grew out all the way to D cups and landed on her face. "Wow, these are huge." she said squeezing them causing you to moan. Your arms slimmed out and your belly got a little bit more fat as your whole upper half jiggled. "Now it's time for your favorite, the butt!" she yelled cackling to herself. "You always loved my dumptruck... so I thought I'd give you one for yourself!" You were in shock by what was happening, you finally got up off of her and regained your balance. You looked down to see your thighs filling up with fat as they wobbled around. You legs became even thicker then your girlfriends and wouldn't stop jiggling. "Now for the finale." she said giving your ass the hardest smack you ever felt. As her had came off of your butt it started to grow. It kept jiggling outward until you had two beachball sized cheeks. They were wiggling around like crazy, and had more recoil then even your girlfriends. The new found weight caused you to fall right on your ass, but you didn't feel a thing with all of your new cushioning.
    "Oh boy, you turned out great." she said scratching your head. "Wh-wh-what? Why? HOW?!" your mind was a mess. "Well for the why, you said I should appreciate my ass so now you too have one to appreciate. For the how, I used my magical ass to change you, I've been granted the ability to let people live in others shoes by just shaking my ass on them. Weird I know, and also a long story." You were stunned, you didn't know what to do. "Also, the only way to turn back is to put on a show for me and my girlfriends." she said giggling. "Here you can even wear the pants your say make my ass look the biggest. See you in the living room in five, you might want to practice in the mirror, also take your shirt off before your come down to." She through the pants at you and left. This was crazy... but you did want to change back... right? You put on the pants and started at your ass for a second. You gave it a squeeze and it felt incredible. Like the nicest pillow you could ever sleep on. You then decided to practice shaking it and it came pretty naturally. It bounced up and down and you had a slight smirk while doing it because of how good you were at it. You took off your shirt to let your boobs free and ran down the stairs. As you ran down your boobs, slight belly, thighs, and butt were all shaking like crazy. You immediately started shaking ass for your girlfriend and all her friends without hesitation. You were loving the attention. You started started wiggling everything around shortly after. Eventually you stopped and they all cheered for you. Then they all walked over to feel your new assets. "Can't you keep him like this a little bit longer?" one asked, "He could come with us to girls night!" another exclaimed. "Well what do you think babe?" your girlfriend asked as you finally could start thinking since they all stopped squeezing. "Just for one night." you said with a smirk as all the other girls came over to you for a group hug. "Well this should be a night to remember." your girlfriend said...