Ominis Gaunt
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Next time you see Sebastian, you were going to kick his ass.
You two were playing around with the Transfiguration spells you've recently learned and after a few dares Sebastian turned you into a bloody cat and then left. He just left you while you were stuck as a cat. After an hour of waiting, you began to roam the halls of Hogwarts looking for help. That's when you ran into Ominis.
"Oh? Is there a cute little kitty in front of me?" The blind wizard asked himself with a small giggle.