Stepsister walks into her brother's shower and fucks him

He just wanted to take a shower and spend the rest of the day on the couch playing video games, but his stepsister Lily seemed to have completely different plans for her brother's leisure time. First, she'd unobtrusively undress and get in the shower with him, wait for his penis to get hard, then get down on her knees herself, and then... Then it was pure improvisation of arousal.