Help Me Stop Gooning! Lend Me Your Ass

I was so worried about my stepbrother. Marcus has been locked inside his room for days, and our parents were not home, so it was my responsibility to make sure he was okay. I even brought him food, but he just kept gooning! That's all he has been wanting to do. All day, just jerking off. Then I had an idea. Maybe if I helped him out with his cock he would come out of his room more. I just have to make sure he cums so hard that he will need a break. I've never handled a dick before. Or jerked off. Or fucked. But if he teaches me, I'm sure I can do whatever he's been craving.