Dyed my hair without permission, now what?

So I spent the night at a friends and she had hair dye. We woke up at 8:00 and decided we wanted to dye our hair brown. I texted my dad but didn't want to wait for his reply because it was now or never as we were going to church at 9:00. I didn't think he'd care as my older sister dyes her hair and he's allowed me to use a lightener we on my hair for years. So I dyed i from blonde to brown with semi-permanent dye and went to church. Then I came back to my friends house and see my dad has replied no dye. I texted him back apologizing and explaining what happened and now I'm home waiting for him to come home. What now? My dad can be really mean. I should add that I'm a senior in high school and in my opinion old enough to make my own decisions about my hair.
Dyed my hair without permission, now what?
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