For Ia z boy's Babysitting Nightmare Challenge
Prompt- Harry agrees to look after the little sister of a fellow classmate while that classmate recovers from an injury sustained during Care of Magical Creatures. But the little sister has mischievous tendencies toward whoever babysits her... who, in this case, happens to be Harry. Minimum: 4 pranks. The required prank for this story must involve Harry dressed in nothing but his underwear. The reason the sister is at Hogwarts (they're not a student) is left up to you.
Harry found out in his fifth year about Cho Chang's sister. It was not a pleasant experience. When Harry looked back on the memory, it almost seemed more horrible than having to fight Voldemort.
Cho Chang had conveniently gotten injured during Care of Magical Creatures right before her little sister, Lee Chang, came to Hogwarts for orientation. Apparently, the pureblood kids came to Hogwarts the year before they enroll and go to orientation where they learn about Hogwarts and stay the night either in the Great Hall or, in Cho's case, with their respective sibling.
As said above, though, Cho Chang had conveniently gotten injured during Care of Magical Creatures, so she asked Harry to watch over Lee in the Gryffindor tower instead. Harry had said okay, wanting to please his love. However, he did not know what he had been getting into. Poor, poor Harry. It probably would have been all right if Cho watched over her sister, but, as said many times, Cho was conveniently injured.
Sorry for the short first chapter, but I needed to set up the background story.