The first time I saw Sean next door "do it", I had no clue what he was doing. I couldn’t see his bed from my bedroom window, but that morning I walked by my window and glanced over, and at an angle looking out my window, I could see him on his bed reflected in the mirror over his dresser. Sean, who is five years older than me, was naked on his back, and would alternate between fisting up and down, and holding his fist still, and thrusting up into it. I had never seen a fully grown ..more.