Josh offers to help Liz relax

After a moment of hesitation josh Says “Well I can show you how to masturbate properly, maybe that will calm you down”

Liz was both uncomfortable and Excited by josh’s offer.

Josh began, “first you want to get a towel or napkin, when you climax it’s going to shoot everywhere”

Liz laughed as the sock she grabbed barely covered half of her erect cock.

Josh went on, “Then you want to grab it in the middle and work it up and down, playing with the head a bit”

After a few deliberately unsuccessful attempts Liz asked in her best innocent voice, “brother will you grab my hand and show me?”

Reluctantly josh grabbed the back of her hand. He was surprised to find it soft, yet firm from the new muscle underneath. He began to guide her strokes up and down, slowly at first.

The animalistic assertive nature began to creep back to Liz. She used all her will to pretend she wasn’t getting arroused. Though she could hear the blood pumping in her ears, in her cock. She could feel her nipples growing harder, rubbing up against her tank top. She was aware of all the new muscle she had gained; her legs felt like tree trunks firm and unmovable, she contracted her lightly visible abs as she rolled her toned shoulders back. She felt like she could do anything, take anyone.

“Josh I can’t feel it, will you play with the head with you other hand, like you said?” Liz said in a mock innocents

Normally all off this would have been way out of the question, but Josh was getting aroused as well. He began playing with her firm tip. He was now beginning to wonder how much pleasure his girlfriend, Emily, would get out of this 9” rock monster. Josh began to get a little self conscious, imagining his sisters chest pressed against the back of Emily; standing, holding Emily by the back of her thighs as she easily moved her on and off this ever growing dick.

Josh snapped back to realize Liz was now guiding his hand on her cock. She had moved his other hand from her tip to her balls. Liz’s free hand was lightly grasping josh by his hair. Josh looked in here eyes, and she back. She had a grin on her face with a far away stare. She was in control.

Liz tightened her grip on the back of Josh’s head and slowly started to lower his face towards her pulsing cock. She wanted him to know what’s was coming.

“Liz, stop” josh said

Liz said “make me big brother” in a mock tone.

As josh’s lips got close to her heated cock he began to turn his face away. Liz tightens her grip, grabbed her dick by the base and began to slap josh across the cheeks. Liz laughed and got even harder, her girth swelling further. Josh was able to weather the first few but the cock was more rigid than he thought possible. It curved slightly up but it did not bend when **** was applied to it. He gave in and open his mouth.

The moment his saliva touched the tip of liz’s cock, Liz lost what little control she had left. Liz began to engage her legs and thrust her hips. She could only get a few inches in due to her in bending member. She punished the roof of josh’s mouth and the big of his throat for 45 seconds before she began to get enraged.

“Lay on the bed with your mouth facing me now” Liz asserted.

Josh did as he was told, with no sense of dignity left. With a clear shot down his throat Liz pumped the full 9 inches in on the first thrust, her balls slapping josh’s chin. She pulled out and Josh tried to get air but she was back in instantly. She grabbed his back and began to work him counter to her thrust, like a flesh light. Liz was in pure ecstasy. Liz reared back as she was about to cum, lifting josh almost completely off the bed by her rigid cock alone. She grasped the back of Joshs head forcing him all the way down as she began to pump cups of semen down Josh’s throat. “ you’re my flashlight now little brother” Liz said in the midst of her moans.

Liz finished but she kept josh’s head down on her cock; this was the moment she had been waiting for. Lizs knees buckled as she felt and incredible sensation roll through her body. And then josh saw it, her balls, the size of gold balls grew to the size of large lemons. Her thoughts thickend and her waist shrunk. She was breathing hard as her chest expanded to a full C. She gained three inches of height. Then she thrusted her hips to make josh look her in they eye, she smiled a wicked grin. Then josh felt it; she was still yet her cock was sliding further down his throat, another 3 inches. His chocked airway began to get inflamed has liz’s girth began to expand. Josh started banging on his sisters stomach, worries that her cock would be stuck if she let it grow any thicker inside of his throat. This aero used Liz and seem to speed up the process. A bulge was starting to appearing on the bottom of Joshs neck and his jaw began to hurt. Just as he was about to pass out she pulled out. They were both amazed. Her cock was now 12” long and as thick as a mag light.