She say she wants your muscular legs and also your penis. Because both of you have the same height so your parents will not know about it. Then your sister hand you her socks, jeans and panties. She say,"this jeans and socks is not look girlish compare to other of my jeans and socks" . Then you take off your shorts and boxer. You start wearing your sister's panties and you start thinking that you are crazy. As you wear it, your penis and balls start shrinking and form a wet and tight vagina that actually belong to your sister. At the same time your ass become more rounder, girly and larger to fix the panties well.
You look to your sister, she start to be more and more excited because her vagina start to grow balls and penis that is originally belong to you. Her ass become more flatter and form your manly ass. She is very excited and call you to continue with her jeans while she start to wear your boxer. You continue with her jeans, before you wear her jeans she already done wearing your shorts and looking at your legs prepare to see the swap. As you wearing the jeans your leg start to swap with your sister. Her legs become more and more muscular while your legs become more and more girly. Your legs starting to loose hair and all the hair move to your sister's legs and cause your sister's legs become hairy. At the end your hip become wider to match your new ass and your sister's hip become flatter to fix her new flat ass.
As the swap finish, your sister ask you for long pants and not to be too boyish and also a pair of socks. You both go to your room and you hand the pants and socks that your sister wants to her and she goes out of your room.
You seat at your bed and start to think of your new equipment. Suddenly, someone come into your room ...
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