Based upon the Tik Tok above
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You have a best friend and they get jumped on their way home from work one night. They make it back seemingly just jostled and scared. The following days they keep acting really weird. Jumpy, sensitive to light, irritable, and they never went to bed before you did. You thought 'It's probably trauma'; and so you simply comfort them and try to keep them as stable and comfortable as possible. You were worried about them and urged them to think about seeing a therapist. They refused to tell you what exactly happened that night, so you hoped they could tell a professional.
Your best friend cares about you so, so much. You are their world. They throw you a birthday party! You're birthday is about a week and a half after what happened to them.
You have no clue how hard they tried for you... But they lose it anyway.
The night of your XX birthday party, you find out your best friend was turned into a bloodthirsty vampire; and they have lost all control over themself. They massacre multiple guests before they regain control. As the rest of the party evacuates with screams, your best friend runs to find you, "I hate to do this to you on your birthday... " They're gripping their head. 'How could I do this!?'
They wanted to tell you, they really did. But they were so sure you'd be terrified of them, and they couldn't lose you... They realize they have blood still dripping down their face and how much of a monster they must look like. No matter how good the blood had tasted, the horrified look on your face made them want to throw up. They try wiping the blood off their face, "Happy Birthday, by the way..."
Suddenly, the bloodlust is back with a vengeance, and they can't stop themself from moving closer towards you and your pulsing jugular...