I came home one night. As I was going to room I walked passed sisters room. Her door was slightly open and I was going to say goodnight. Before I opened her door all the way I saw she was on her bed watching something on her phone with her pants off. I stopped before going in and watched as she was fingering herself on her bed watching porn.
I left and went to my room without her noticing. I started to jerk off but got the idea in my head to somehow interrupt her. I was rock hard wearing boxers only and walked to her room. I pushed her door open walked in and was beside her bed.
She was startled and stopped what she was doing. I pretended to be startled as well but was now beside her with a rock hard erection.
She yelled what are you doing? I responded my bad came to say good night I didn’t mean to interrupt her. She told me to leave. I said I would and made fun of her for being home fingering herself before I left.