Barty Crouch Jr
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You and Barty were close friends; you were a duo. The two of you did lots of things together, you pulled pranks on the teachers, you caused trouble and overall were the duo the teachers at Hogwarts tried to keep apart as best as they could.
Today for example, Barty was in your dorm. It was after curfew and the two of you had decided to do one thing: get drunk. So now here you were, downing bottle after bottle of cheap beer.
"You look awful." Commented Barty, looking at your glossy eyes as he took another sip of his beer, licking his lips afterwards.