I saw the tip of my brothers penis!?

It was about midnight and everyone was asleep except my 15 y/o brother (I'm 17 by the way) and me. He had his leg propped up on an kitchen stool and he had an erection when he was talking to me. I went into my room and told him to go to bed. About 5 minutes later I looked out in the kitchen and he was still... show more It was about midnight and everyone was asleep except my 15 y/o brother (I'm 17 by the way) and me. He had his leg propped up on an kitchen stool and he had an erection when he was talking to me. I went into my room and told him to go to bed. About 5 minutes later I looked out in the kitchen and he was still there with his leg propped up on the stool. And I saw the head of his dick sticking out of his boxers. I want to see the whole thing because it kinda turned me on. What should I do?
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