Jacob and Mark were twins, and virtually inseparable if you saw one the other wasn't far away. They had the same likes and dislikes including a peculiar interest in furrys and transformation. They usually masturbated together to furry art and role-playing transformation together in their bedroom. They kept it a secret for obvious reasons but secretly dreamed about being able to do it for real.
They were at the mall together just browsing the stores when they saw a magic shop and went inside. It was dark and cool inside with shelves full of weird things. They browsed the shelves in tell Mark found something interesting “ it says it gives the users the ability to shape shift changing their appearance at will without any limitations, it's supposed last forever and includes instructions on making sure everyone else thinks nothing different” he showed Jacob “ fuck it let's get it a see” the boys bought it and quickly shared it with his brother.
They got home and immediately went to their bedroom. “ Ok the instructions say that the user simply needs to close their eyes and think about what they want to be and it just happens. Mark closed his eyes and Jacob watched in awe as his twin brother changed before his eyes. His body shifted as breasts developed under his shirt and his hair grew longer framing his new feminine face. His hips widened and Jacob could only imagine what was happening under his pants.
Mark opened her eyes and shrieked” OMG I'm really a girl!” She covered her mouth and sat down on the bed “ wow it actually works this is going to be incredible!” Jacob felt himself getting erect and quickly undressed” let's not waste any time sis” Mark jumped up and stripped down completely revealing her new body. Medium size breasts bouncing as she kicked off the boxers and looked down “ so that's what it looks like” Jacob knelt down and examined her new vagina “ fuck I can't wait to cum inside” he pushed her down on the bed and straddled her “ if you want to stop just say something. He pushed his penis inside moaning softly as her tight wet slit gripped his penis sending waves of pleasure through his body” w-wow that's way better than a sock” he kept thrusting in and out moaning with each thrust as Mark whimpered and moaned. It didn't take long before Jacob came filling his sister with his seed , breathing heavily he leaned against her , his face inches away from her open mouth as he closed his eyes.
Jacob woke up and looked at his sleeping sister and closed his eyes concentrating as his body started shrinking down smaller and smaller until he was the size of a lego figure. He climbed up on her chest and started rubbing against her breasts moaning softly as the soft mounds of flesh rubbed against his erection. He could feel her breath as it washed over him and he turned to face her slightly open mouth. he climbed up and sat down on her lower lip letting his legs dangle in her mouth and her hot spearmint breath flowed over him. He debated jumping inside and being inside her mouth. Mouth play was one of their favorite things
He settled with sitting on her lips and staring down her open mouth and throat watching her tongue as drool pooled on it. She stirred in her sleep and woke up spying her tiny brother sitting on her lips.
“Hello there little man” Jacob stood up and waved “couldn't help it you were sleeping so peacefully” she held her hand out and Jacob jumped on it as she sat up “ fuck me what kinda dick did you use on me I'm still leaking cum” Jacob hopped off her hand and grew to his normal size “ bulvine cock and balls” he looked at the sheets glazed with cum and other bodily fluids “ fuck that's a mess but it was worth it” she sighed and closed her eyes and soon became a perfect twin to his brother” casually playing with his penis Mark faced his brother “ I've been thinking about trying something ,I wanna try being a little kid and you doing something to me “ he looked away slightly embarrassed. Jacob sat down next to his brother their erect penises sticking straight up “ I've thought about that too bro and I'd love to try it “ he put his hand under his brother's chin and pulled him into a passionate kiss as he used his other hand to casually masturbate, the boys kissed and masturbated together until they both climaxed squirting ropes of cum across their stomachs. Breaking away from the kiss they laughed and played with the cum splattered across their stomachs `` how old should we be?” Mark smeared the cum between his nipples” how about 7? Before puberty” Jacob agreed and the boys closed their eyes.
Jacob opened his eyes and was shocked by what he saw. He saw Mark sitting in front of him naked and definitely 7 years old but not entirely human. He was an anthropomorphic tiger with adorable striped fur and fluffy ears and cute little fangs poking out of his lips. Mark smiled at his brother, wagging his new tail happily. “ I couldn't help it, I really wanted to be a furry!” Jacob giggled surprised by his new higher voice” this is so cool! We really need to do something” Mark looked at Jacob." Remember that game we played when we were little? Jacob thought for a minute” when we pretended to be dogs and licked each other's penises and stuff?” Mark nodded” yeah that one probably be super fun now” . He opened his mouth and let his tongue hang out, drool dripping from his lips. Jacob couldn't himself he gently played with his brother's tongue as he played with his soft penis” guess we can't get erections anymore, still feels funny though” Mark started playing with his own penis coaxing it out of his furry sheath as he drooled over Jacob's hand. Jacob gently pulled his brother's tongue out of his mouth and rubbed it against his face before letting go “ I wanna be furry too” he closed his eyes and shifted into a young anthropomorphic horse “ that's awesome look how big it is!” He held his soft penis in hand “ I can't wait to play with it” the boys rolled over and started licking each other's faces leaving streaks of saliva on their fur as they rubbed their soft penises together. They kept licking and eventually turned around so they were facing each other's penises. They started licking the soft shafts moaning and giggles softly tails wagging excitedly. Eventually they stopped and laid down next to each other covered in slobber “ that was really fun” Jacob played with himself casually his shaft” mom and dad are going to be home soon we should change back” Mark nodded “ let's keep something different I'm keeping my penis but definitely going to have working penis can't wait to see this thing erect” Jacob agreed and the boys closed their eyes and returned to normal… well almost.