My stepsister was on the phone with her boyfriend, talking and laughing as if nothing were wrong. I walked into the room, closed the door, and started touching her from behind. At first she tensed up, but when I slipped my fingers inside her, a moan escaped her lips. Her boyfriend asked, “What’s going on?” and she told him it was nothing. I kept going until she pulled down her shorts and got on her knees to go down on me while she kept trying to talk normally.
