"Penis! I'll go first."

Karen still seemed a little nervous, so John said, "Penis! I'll go first." She looked relieved. She took a notepad and pen from the coffee table in front of the couch, looking a bit like a naughty librarian with her glasses and her partially open blouse.

Bolstered in confidence by the **** and the very successful 'research' this afternoon, he stood up and unbuttoned his shirt. Karen just watched him, wondering why he needed to take off his shirt to show her his penis. But then the question left her head as she watched his muscles move under his skin. As he took his shirt off, he kicked his shoes off as well, and they rolled under the coffee table. Then he unsnapped his jeans and dropped them to the floor along with his boxers in one swift motion.

"Oh, my God!" Karen exclaimed at the sight of his massive member. "You're fucking huge!" She blinked at him, gape-mouthed, and thought the temperature in the room had gone up considerably. She got a very warm feeling especially between her legs. All of her research online had said average penis length was four to six inches. John was practically twice that length.

John had never heard Karen swear more than a 'damn' or 'crap'. He liked the reaction both Karen and Rachel had to his cock. He was, of course, fully erect.

After staring for some time, Karen finally shook her head and started drawing in her notepad. "Can I measure it?"

"Sure, but it's 9 and 5/8 inches long. I measured it."

"I can't just take your word for it. A scientist always takes their own measurements." John thought Karen was so cute when she got all scientifically prim and proper. She brandished a measuring tape, like for measuring cloth.

Karen reached out and ran her fingers along his cock's length. John shuddered at her touch. "It's bumpier than I thought it would be. And it really puts out a lot of heat." She felt a tingle in her belly and lower when she stroked the shaft. Her nipples were hard and rubbing on her blouse. Again she had to shake her head to focus. She took the measuring tape, put the tip into John's pubic hair, and pulled it out to the tip. "24.45 centimeters. Yup, 9 and 5/8 inches. Very impressive. 5 and 1/2 is average." She wrapped the tape around just behind the large mushroom head. "10 and 3/4 centimeters around. That's 4 and a 1/4 inches. And it's ..." She measured at the base. "... 14 and 3/4 at the base. Wow, that's nearly 2 inches across." Karen got lost in looking at the large cock in her hand. She pumped her hand up and down it's length.

John moaned. "Um, Karen..."

"I want to see it work," she said with some determination.

"Er, I recommend you take your blouse off. It can shoot pretty far."

Karen looked up at him for the first time since he took his pants off. "Thank you, that's very thoughtful."

She unbuttoned her blouse the rest of the way. John held his breath while she took off the shirt. Seeing Karen's breasts, even covered by a plain bra, was pretty thrilling to him.

"I don't want this to get stained either. I just bought it." Karen reached back and unhooked her bra. John's eyes went wide as the gorgeous nerd took her bra off in front of him. The nipples were hard, and made him want to suck and bite them. When she touched his cock again, he let out the breath he had been holding. The booze was really affecting her, removing her inhibitions and turning her on, along with the display of fine male flesh in front of her. She rubbed his shaft up and down rapidly. He shifted so he was right in front of her, pointing straight at her chest. As she jerked him off, her tits jiggle and wobble like asteroids perturbed by Jupiter's gravitational ****. Her eyes moved up his body until she was looking him straight in the face.

"Come for me, baby, give me your spunk. Spray it all over my tits! Cover my tits in your junk, baby! Your cock is amazing!" Karen said with a sexy little growl. Once she's snuck downstairs while her parents were watching porn late at night. That was a quote from the movie.

He couldn't handle Karen dirty-talking or jiggling her boobs. With a loud grunt, he came, shooting cum straight in Karen's face and then on her tits. She squealed happily and continued jerking him off. He kept coming and coming, until he was finally spent. He looked down to see her whole chest covered in jizz. One big lump was at the corner of her mouth, and he watched her tongue dart out and lick it off. She smacked her lips and purred.

"That was amazing! Wow! I've never seen anything like that since watching Kilauea erupt in Hawaii. And it tastes good too." Karen dipped her finger in some sperm on her tit and licked it off.

His geeky friend just compared his cock going off to a volcano erupting! How cool was that!