Thumbs up
You sit in front of your lover, facing his penis. You wrap your hands around his penis and have your thumbs up, massaging his most sensitive spots: the frenulum and coronal ridge.

Balltrick
With one hand you stimulate his penis. With the other hand you go to the underside of the penis, where the scrotum starts. You tug the scrotum upwards, along the shaft. Hold it there, your hand around the shaft, the skin of the scrotum stuck between your hand and the shaft. The balls hang freely from the body, making them move and vibrate while you caress his penis with your other hand.