You saw your enemy, Scaramouche, fucking another woman by the staircase. But why are you feeling... jealousy?!

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TLDR;

Scaramouche, ever since, transferring to your university, he had deliberately stolen the spotlight, the attention and favour of practically everyone at campus. Then he'd stick his tongue out in your direction.

He hated you, clearly, and you hate him back. So why?...Why do you care so much about him taking other women to his bed?! — hold on, why are you suddenly alone in an old classroom with him?!

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rawr~