I will get fat injection but after 20 days ı must sit. What can ı do?:(

I will get fat injection to my butt. But there is a problem. I know that after the surgery ı must avoid sitting for 3 weeks. But Im college student. I must sit down in lessons.:( what can ı do? Lessons starıing İn septemper 15 and ı will get surgery in 25 august. If ı sit is my butt shape will change? Or fat cells will die ?

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