I Like Big Butts (TG, TF)

You were lifting weights at home with your sister when you saw her looking at herself in the mirror. She kept flexing and looking at her abs. "You know, the only reason you need to hit the gym is your ass sis, thats all guys care about." you said. She slowly turned around giving you the dirtiest look, "you think I'm doing this for perverts like you?" she asked disgusted. "I'm just being honest, and come on who lifts for themselves?" Your sister was in shock and couldn't believe what she was hearing. "... You know what? Maybe you're right." she said in an odd tone, "thank you for coming to your senses," you said smugly. "But, just to be sure you're right let me do a little test." she said pointing her hand at you like a gun. "What're you gonna do with tha..." but before you could get your question out your sister's hand shot a pink laser at you causing you to feel hot all over.
    "What did you?" you yelled as your voice started cracking unusually. You felt your neck to realize your Adam's apple was entirely gone. Next your hair grew down past your chest and became a lovely brunette. It felt so soft on your shoulder and smelt wonderful. Next your nose slimmed and your lashes grew out. You eyebrows thinned and finally, your lips swelled to twice the size looking like two pillows on your face. When you looked at yourself in the mirror you looked entirely like a woman from the neck up. "Like, seriously girly? What is going on right now?!" You said pouting your lips. You quickly covered your mouth in shock of what just came out as your sister rolled on the floor laughing. Next right where the hair had landed on your shirtless chest a tingling sensation started, and out shot two of the nicest breast you'd ever seen. Two solid Ds, and they were coming from your body! You started squeezing them and playing with them and you had never felt so good in your life. Whilst you were enjoying your new found chest your arms slimmed and your waist caved in as your stomach became a little more defined. "Ohhh now for the part to really test your theory." your sister said with a menacing smirk. Your thighs thickened up like two Thanksgiving turkey's and jiggled like crazy. You finally came out of your titty trance and reached down to stop the jiggling to feel the two squishiest and softest thighs you'd ever felt. "HERE COMES YOUR FAVORITE." your sister cackled. You gulped scared of how big your butt may become. And as you were thinking of what the worst possible outcome may be, a much worse one then you could've imagined came true. Your butt first just became a little bit rounder then usual, then it became as big as your sisters who had been working on it for quite a while, then it inflated to the size of Kim K's! "OMG. I have a Kardashian booty!" you squealed partially excited and partially terrified with your contrasting new thoughts. And just when you thought it had reached its max it kept growing, and growing, and growing until it had become the biggest most bootilicious butt a girl could have. Your sister quickly smacked it and it jiggled like Jello. "Wow, your recoil is unmatched brother... or sister for the time being I suppose." She said with a wink. 
    "Now, time to go put the butt to work girl. To see if guys only care about the butt, I'm gonna get your buddy hear soon to give him the biggest pair of knockers I've ever seen. Then I will be the control. We are all gonna see how many guys we can get with to see what truly matters, and I will be judging the quality of man." she stated, "now get out there while I get your friend here!" she yelled smacking your butt causing you to run out of the room. You saw a pile of clothes with a sticky note on it, "so you don't go around nude." You slipped on the tight white top and put on some Jean shorts that ripped on the sides your butt was so big. As soon as you stepped outside a car stop right in front of you. The window rolled down and in the car was the biggest group of hunks you'd ever seen. "Hiya boys. I'm like totally looking for some daddies to help me with all this totes massive cake." You send bending over and twerking for them. You ass rippled and jiggled insanely. "uhhh yeah get it baby girl." the man driving said. You hopped in the car and they all started squeezing you. Some of them were hugging your massive ass, while one of them thrusted his dick in and out of it. It rippled with each thrust in a vibrated with each pull out. You had never had such an incredible feeling in your life. On your chest region the driver was reaching back grabbing one tit while a different man grabbed the other. Then on of the men removed both their hands and started titty fucking you. "Oh my gooooood!" you moaned as every new sexual experience you were having caused you to pass out. When you finally came to you had been left on the side walk somewhere in the city and had cum dripping from your ass and tits. "Like, this is totally not what I wanted to do with my Saturday." you pouted while crossing your arms over your massive chest. You wondered how it was going for your sister and your friend...

(GIF made by johnrodo3)