Brother can only cum when sister tell him
Now where were we?... Mmm, that cock! As your sister, I'm taking things into my own hands here. You're going to cum only when I tell you to, okay? Since I'm in control, you have no say in the matter! You definitely need to build up that strength! Don't cum too quickly. How will you ever last with another girl? No, you can't touch me. Not yet. Let's focus on this throbbing thing in between us. Try to hold back. I'm going to edge you and edge you and edge you... Okay, let's finish with a simple countdown from ten. You can follow those instructions, right?