Sister jerks him off until he ejaculates

I Was quiet in my bedroom to watch porn when it arrived my sister. It is always so, no knocks ever at the door before entering. Without telling me nothing, he is stripped naked and trying clothes in the closet. You made it count that I had an erection and thought that it was because of her. But it was because of the porn that I was watching, I would have told you this but she told me I could jerk off. Then I told the truth. She approached the bed and sat above me. She grabbed my cock and started to masturbate, stroking my penis with her hands while touching her tits. Then he started doing it with her vagina. He wanked while I was doing the saw. It was so until I ejaculated on her.