Stop him

You grab Rex’s pants, making him fall face-first onto the floor. His dick’s getting smaller, thinner the more it bleeds. You drag him over to you, he looks terrified.

“Hey, you sick fuck, why’d you do that?!” his penis is getting much thinner and is down to five inches or so.

You get right in his face, “Give. Me. The key.”

“Fine, fine,” he struggles to find it in his fallen pants. His dick’s bled down to four inches, he’ll look like you soon. He finds the key and hands it over, then tries to retreat again by crawling to the bathroom.