DANDY-528 "The distance between the dick and pussy is 3cm! While jerking off while peeping at my defenseless sister, I thought I'd get yelled at, but it turned out to be mutual masturbation" VOL.1

A brother masturbating while his unsuspecting sister is unprepared. The sister, pretending not to notice, starts masturbating herself, which excites the brother even more as he reaches out to touch her, but she refuses to be touched. However, yielding to her brother's demands, they begin mutual masturbation, looking but not touching each other. Despite agreeing to just watch, the excited brother's penis and sister's vagina come within 3 centimeters of each other…