I love renovations!!
When I was 15 my family began a renovation of our main bathroom...it involved ripping out the walls down to the studs. During the demolition, the sheetrock behind the bathroom (a stairwell to the attic) had a small dent pushed into it. I discovered that I could pull a small piece of the wall board out and have a spyhole into the bathroom. Every morning I would wake up and wait until I heard my sister (she was 14) go into the bathroom to start her morning routine. I would stand as silently as I could in the stairwell...my breathing sounded so loud and my heartbeat was always racing. I would watch her undress from the sweatpants and t-shirt she slept in. I would always get a raging hardon seeing that she slept with no panties on.
As the water warmed up for her shower, she would stand in front of the full length mirror admiring her developing breasts and rubbing her body all over. Almost everyday, she would lean her back against the vanity and spread her legs, running her fingers up the outside of both her pussy lips. Sometimes she would even slip her index finger in between her lips and put it onto her tongue to taste herself. I would stand with my eye pressed up to the small hole in the wall watching every move she made and beating off furiously. I almost always shot a load before she could get into the shower. Then while she showered I leaned back onto the stairs and continuously brought myself as close to cumming as I could and then stop (my viewing hole didn't allow me to see into the shower).
After her shower was finished she would step out to dry off and she would put one leg up onto the counter to dry off her leg. This gave me my best view of her pussy and I waited till I could see right up into her to shoot my second load. I had to be totally silent, which was sooo hard to do, and just let it spray out onto the wall and stairs. My favorite part of all was to sneak back into the hall and be 'waiting' when she came back out to go to her room, with just a towel wrapped around her. Due to complications with the contractor, the bathroom was under renovation for nearly six months. Monday thru Friday I would beat off to my sister's morning routine until that wall was finally finished. Because of that experience, I still start my day with two jerk-offs each morning!