Took a big chance; well worth it.
At at the age of thirteen, I began to realize I was a voyeur. My first delicious taste was spying on the incredibly well-developed sisters who lived across the street from me. I would rush home from the bus stop, head to the side basement entrance to our house, and wait for them to walk by. I would be hard and pumping by the time they'd be passing. Just to see their firm, shaking tits and full asses in motion would bring me to cumming.
But one of my most daring and unbelievably hot moments occured indoors. My ex-sister-in-law stayed friends with our family after getting divorced, and would often come by to chat with my mom. She had a child with her new husband and would bring the baby with her. I couldn't help but notice how huge and swollen her tits had become. I decided to try to get a look at her while she was in our kitchen talking. Our staircase split off at the bottom landing, one small flight going to the living room, one to the kitchen. I worked my way down the kitchen flight and positioned myself at the door, which was open just enough to see through the crack. There she was, talking away, baby in her lap. It was more than arousing enough for me to take my cock in my hand and begin to jack off, looking at her full tits. But then, I was rewarded for taking such a daring chance...without missing a beat in her conversation, she lifted up her shirt, pulled one of those great tits from her bra, and stuck it in the baby's mouth. My God. I can still see that engorged breast, laced with purple veins, and the incredible full, hard, pouting nipple. I was in awe and savage horniness as I kept stroking, bringing myself to cum and saturating the carpeting of the stairs.