By the balls!

You’ve developed the skills necessary to hold your own in close-quarters grappling. You gain the following benefits:

• You have advantage on attack rolls against a creature you are grappling.
• When you take the Attack action on your turn, you may replace one of your attacks to try to pin a creature grappled by you. To do so, make another grapple check. If you succeed, the creature is restrained. While restrained by you, the creature can not make attacks, or cast spells that require somatic components.