Some years ago, I arrived home early from work one afternoon, and 'caught' my ex-stepdau laying face down on her bed, humping furiously on her pillow.....her bedroom door was wide open, and I could not help seeing her as the living room was next to her room (we lived a a three bed flat)......She obviously assumed she was home alone, and was not expecting anyone! She had not heard me come in, and I just stood and gazed at her as her rounded and amazing butt was clenching as she humped, and the sounds she was making were just beautiful.....of course, I got very hard watching this amazing sight! She was such a lovely, curvy and well 'developed' young lady, and I could not help myself!