"Call me 'Mom'"

Jim didn't think it was possible but his cock grew even stiffer as it rubbed into his step-mom's panties. "Yes Mom" he said.

Tessa moaned. "Mmmmmm.... yes.... please do it again."

Jim smirked. "Okay Mom."

Tessa ran her fingers through her hair. "Keep doing it."

It was as if the entire world faded away. A short time ago it seemed naughty to have accidentally glimpsed his step-mom. Now Jim was doing this. Now he was about to say this, "I'm hard for you Mom"

"I'm so wet for you Jimmy!" Tessa was completely enveloped in arousal. Her nipples looked like they could cut glass. Her tits bounced furiously. Drool slipped down her thick lips, as if she was too lost to remember to swallow, or maybe too hungry to hold it back. She closed her eyes as if their agreement sent her further down a spiral she could never recover from. "Jimmy... do you like Mommy's tits?"

Jim's cock pulsed. Things had gone absolutely insane and he wasn't sure if they would ever go back. He didn't mind the thought. "I love Mommy's tits." He said.

Tessa moaned and squeezed her big breasts, then looked down at her step-sons eager cock as it rubbed into her soaked underwear. "Oh god, Mommy loves your cock." She said as she thrust herself against it. "It's not fair that Mommy isn't allowed to have it. I've had so many cocks but I've never wanted one more than this."

Who was stopping her? Jim wondered, other than herself. "Mommy can take what she wants." Jim said with a playful smile.

Tessa's eyes rolled over with terror. "Don't say that. Mommy is weak." Her drenched panties began to bunch up at the crotch. Jim thought he wouldn't have to do much for her slit to be exposed and for his member to slide right in. "If Mommy goes too far, she might never come back. She might become mad with lust. Jimmy has to be strong for both of us."

Jim didn't care much for being saddled with this sudden responsibility. It was ridiculous to ask it of him, especially at this moment. "What if I can't?" Jim asked.

For a moment Tessa stopped thrusting, her breathing very labored, her lips shivering, she reached down and wrapped her hands around her step-son's face. "My life is in your hands. Do what you want with mommy."