My sister and I live together since she got divorced. She works at a company but comes home late every day, always taking off her suit and changing into black pantyhose right away. It seems like she doesn't care much about how she looks or acts. In fact, I get turned on by seeing her underwear and ass, but she never notices my excitement. One night, she falls asleep without wearing any panties underneath her pantyhose. Unable to control myself anymore, I decide to take advantage of this opportunity... But surprisingly enough, she doesn't seem to mind too much! Instead, maybe all that built-up sexual tension from being single for so long makes her eager to use my cock as a release?