Continued from Role changing
It felt like me and my girlfriend ran out of sexual activities.
Searching for magic clothing of gender transformation I stumbled upon accessories and ended up buying a magic leash.
After putting it on, it quickly reshaped my body. My girlfriend grabbed the leash and started commanding me. Soon she discovered I was under her command, as long as she held the leash.
She stepped things up a little as well, introducing a third member into the activity.
She gave him my leash and told him to use me at will.