During the summer vacation, my sister brought her friends home, but an accident happened where the air conditioner in the room broke down, turning it into a greenhouse! The fan's breeze didn't cool us down at all, and we were both drenched in sweat. So, she took off her top, flipped up her skirt, flashing her panties and nipples! Seeing my sister and her friends in such uninhibited states made me flustered and fully erect... Of course, my sister's friends noticed, but they seemed to want to vent their frustration and actually begged for it. As a result, I ended up having sex and ejaculating inside both my sister's friend and even my own sister multiple times!
