Two belly buttons and two dicks. How can they be used at the same time? Insert a dick into each other's navel at the same time and fuck!

In addition, blows will be delivered to a relaxed stomach.
Alex will hit Kevin in the stomach with a stick, then squeeze the belt in the middle of Kevin's stomach and beat him.

Trampling. As without it, Kevin loves when his stomach is trampled, also soft and relaxed.

Naturally, from all this there will be have a hardon!