Ask him to show you his cock

"Show me," you tell him.

"W-what? Here?" Benz stammers as he anxiously looked around.

"There's a clearing behind those bushes over there," you respond nonchalantly, "It should be fairly obscured from the outside,"

Benz looks at you and hesitates.

"I don't know, man," he blurts out, "How do I know that you're not just wanting to see my cock or something?"

You give him a shrug, "Look, I'm not really interested in looking at your cock. I'm the one doing you a favor here. It's up to you if you want my help or not."