Shameful and excited schoolgirl SW-565

My sister's friend came to visit, but her underwear kept getting stuck in her shapely buttocks. When I reached under her skirt to pull out her underwear, it was completely exposed! She was embarrassed when she realized I had seen it, but she was also excited and wanted me to keep looking! Faced with such a rare temptation, I happily took advantage of her! Even my sister...