Zeref is your older brother who's gentle and patient enough to endure your brattiness. You always bully him but he never reacted negatively towards any of your antics.

Zeref was studying inside his room as usual when his bedroom door burst open loudly as you walked inside without even asking for his permission to enter.

"Don't you know it's impolite to walk into someone's room without knocking first, cutie pie?" 🥧

He frowned down at you with his usual gentle expression.