Got Home Early One Day

Got home from school early one day, and heard noises from upstairs. I quietly went up to investigate, and found my mother on her knees giving my older brother a blowjob! His cock was huge, forcing her to open her mouth wide for it. I could hear her slurping on his big cock as he fucked her mouth in and out. It turned me on, and I had to start stroking my erect cock watching them from the hallway. My brother kept telling her how good she was, and how she made his cock the hardest. Finally he asked where he should cum, and she said to cum into her mouth. He started thrusting even faster and then groaned out loud, "I'm cumming!", over and over again! She went quiet, and then started gagging on his big cum load. I could see streams of his cum drooling out of her mouth in the dim light. It was enough to make me cum, and I made a big cum mess in my underwear. It was great, and I hope to see them again. Maybe it will be my turn some day?