Bill hides the van.

The van bounces and turns sharply causing Mona and Luke to slide together in the back. The two girls clutch one another in hungry lust as the van keeps moving sharply then suddenly stops and Bill kills the engine. The sound of sirens grows less. Bill exits and slides open the van door to regard the two naked horny captives. He climbs in and pulls the door closed. “Gonna have to lie low. And that means you two little sluts are going to entertain me. Thumper... you’re going to suck my cock again...” he instructed as he unbuckled his pants.

Luke... Thumper nodded as she approached his cock and pushed his pants down then set to work, taking it in her mouth. As she did so she took the X-Change pill from her collar and reached up between his legs. He gasped in surprise as she used her finger to push it into his rectum and then probed deeper to find his prostrate, small fingers straining. She found it! She felt a little guilty as she ground the tablet to easily absorbed dust against his prostate. Instant X-Change suppository. She kept sucking and massaging his prostate and then he gasped as the X-Change took hold, increasing the sensitivity of his cock tenfold. She felt his cock and balls shrinking and he made confused lustful noises of growing pitch. His cock suddenly hardened and his balls emptied, filling her mouth with the last jism he’d ever produce. She kept it in her mouth without swallowing as his changes accelerated. She couldn’t find his prostate any more and his balls were gone. His cock slid from her mouth and she found herself sucking a tiny erect clit. Bill kept thrusting her womanly hips.

Thumper... Luke pulled her lips apart and pushed her fingers into Bills newly formed cunt, widening the cavity. Then she let the jism in her mouth out to fill Bill’s new sex. She started the finger fuck Bill, massaging the seed as deep as she could. The pills were most likely Breeder pills. And little Bill was going to get pregnant if Luke had her way...