During summer vacation, my sister brought her friend over to our house, but the air conditioner in the room was broken, so it was like a hothouse and not cool at all! My brother, who was at home, was kind enough to bring out the electric fan, but my sister's friend, wanting to cool down, lifted her skirt and spread her chest in front of the fan, exposing her panties and nipples! When my brother's friend saw my brother's erect penis in such a defenseless state...