I caught my brother having sex. How do I get over it?

UpUpAndAwayComet
I went to bed late and forgot my brother and his girlfriend were sleeping in my room. I saw him on her and not only that she was wearing my hello kitty headband! I mumbled sorry and went back on the couch. Iwas so traumatized, I forgot my blanket and pillow. I didn't see much and I didn't want too.
At breakfast he still gave me a hug and apologized. He also have me $20.00 (I don't know if it's to bribe me or he's genuinely sorry). I've been quiet the whole day and not making eye contact.
Why? Why in my bed? Why my hello kitty headband? Why my sheets? Why him and his girlfriend were naked?
I caught my brother having sex. How do I get over it?
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