It was a regular day after school. I rushed to my room and did my daily ritual of masturbating. However, this day would end up different. My sister barges in and sees me looking at my computer with my hand on my penis. I tried covering up as fast as I could but it was no use. She quickly pretended that nothing happened and left and closed the door behind her.
Later that day, she came into my room and asked me if I was embarrassed. I tried to play it off cool and pretended not to know what she was talking about. Suddenly she put her hand on my crotch. It instantly sprang up. Whoa! I didn't know what to think.
She said, 'It's ok. I don't care.' So I unzipped my pants and started stroking myself. My sister began unzipping her pants and slowly massaging her crotch with her panties on.
I was so turned on at this point. I got up and got over her. Her eyes were still closed rubbing herself. The moans and groans I can still remember. That was enough to make me blow my load. I had ejaculated all over her. She didn't seem to mind.