Just like the instructions say, you have to move your cursor around the screen. If an area is a hotspot (like his chest), the cursor will change and the bar will increase. If you are not touching a hotspot, the bar might decrease. Certain areas require clicking, so you'll notice that your cursor changed into a pointing finger.
FIRST SCENE: Touch his chest/stomach. Once he spreads his legs, his crotch area becomes available (you have to click on it). If you click and nothing happens, continue touching his chest. After he gets hard, you can continue clicking his pants. If it stops working, move back to his chest until his pants open. Now you can click as much as you want.
You can let him finish if you want or continue.
SECOND SCENE: You can hover over his back, his hand, his buttocks and his balls. Once the bar reaches almost 400%, you'll be able to remove his underwear by clicking on it whenever there's a pointing finger cursor. Now you can hover your cursor between his butt. If you click on it, you'll insert a vibrator. You can turn it on and off by hovering over the "1" button.
And that's it.