DANDY-942 I was caught sniffing my slutty sister-in-law's panties and started face-sitting everywhere.

A dull older brother and a cheeky younger sister. My sister seems to be a slut. One day, when the older brother was sniffing his younger sister's pants, which happened to be on the floor, he was discovered by the younger sister. Although she feels sick, she plays a prank and facesittes on her brother, and ends up cumming with his cunnilingus. The tsundere younger sister, shaken by frustration and pleasure, begins to seek her brother...