Slytherins Black Panther

Professor Snape gets a black cat. All the Slytherin love the animal. Everyone else likes to try and hurt it. What they don't know is that the cat is actually Harry Potter and when he's angry he turns into a giant black panther. Harry likes to protect Draco. He also has a crush on him and the Weasley twins. Tom Riddle has come to Hogwarts also as his younger self. He disguised himself as his 'son'. What happens when the twins notice Harry's comfort towards them?

Find out. The ships are:
Harry x Draco x Fred and George
Sev x Tom Riddle
Wolstar (not much)