AIO? My brother had sex in my car

So this just happened and I’m really disgusted. I was in my room and I came downstairs to empty out the trash at night and so I go outside to take the trash out and see that my back car light was on inside now I have tinted window so I couldn’t see inside from afar so I went up to my car and squinted inside of the window, and I saw my brother and some random girl having sex in my car, I banged on the door and they immediately covered up and got out and he profusely apologized to me. I’m not sure how I should feel about this, but I feel disgusted and I don’t even know if I wanna speak to him ever again. Am I overreacting?