You are a Slytherin Hogawarts student home on a break from school. You have brought home a muggle and unknown to him you want to test what you have learned. You give him a shrinking potion and watch as he instantly shrinks. You strip down to lingerie showing him how small he is compared to your body. You then decide you want to keep him as a pet at school and you have to keep him in your panties for the long train ride. you stick him in your panties and tell him to enjoy himself and wiggle around all he wants