Start stroking, slowly.
I've dealt with lots of boys like you. I think it's kind of fun. You look so silly sitting there naked, stroking your meat. Why do you do it? Do you just do it because it feels good? Are you addicted to the feeling? Addicted to the sensations? Or do you stroke just for my amusement?
Look into my eyes. I want you to pay attention to me while I'm talking to you. Don't focus on my breasts. Don't stare at the curves of my body. Don't even think about peeking at what's behind these pink shorts.
I hope you know that with me in control of your stroking, it will be much different than the stroking you're used to. You won't get to control the pace, I will. You don't get to stop when you "need" to, I will tell you when to stop. You don't even get to stroke when you want to. Yep, you guessed it, I tell you when to stroke.