DESCRIPTION<br/>Arnold's always had a crush on his cute step-sister Serena, and she's always been happy to tease him. That is, until the day she asks him for a kinky favor. It seems her virgin cousins are finally interested in men, and they want Arnold to educate them on male anatomy. When he agrees, Serena makes him a deal: Satisfy the horny twins in whatever way they want, and she'll give him what he's been dreaming of since their parents got married!<br/><br/>EXCERPT<br/>Vanessa gasped as my cock continued to thicken, and lengthen. I combed a few pubic hairs away from the shaft.<br/><br/>"That's supposed to go inside me?" said Carly. "No."<br/><br/>"Wow," said Vanessa.<br/><br/>"Well, okay, see? It's not...it's not too small."<br/><br/>"What happens next?" said Vanessa.<br/><br/>"What do you mean? It doesn't grow wings or anything."<br/><br/>Vanessa giggled. "No, I mean...what happens when you...um..."<br/><br/>"What?" <br/><br/>She twisted the hem of her nightgown at her pale waist. Beside her, Carly looked like she wanted to put her breasts away. "When you...jerk off?" said Vanessa.<br/><br/>Good question. I looked to Serena and she tried to feign innocence. "What happens?" I said. <br/><br/>"Did I not mention the girls wanted to see that?" said Serena.<br/><br/>"Oh, did you not mention-?" I laughed. "What, you want me to masturbate?" <br/><br/>"You don't have to," said Vanessa.<br/><br/>"Well of course I don't have to," I said. "I'm..." What was I? I was more turned on than I expected. Even without seeing the girls' naughty bits I was comfortable here now, and my cock was stiff in my hand. Not as stiff as it could be, though. I knew it could get harder than this, bigger than this... Was it really going so much farther to rub one out for the girls?<br/><br/>"You don't have to," Carly repeated.<br/><br/>But I'd already made up my mind. Why waste a perfectly good erection? And as long as Vanessa kept shooting me those hungry looks (and Serena kept stealing furtive glances from my crotch to my eyes), I could do it. "Okay," I said. "You want it, you got it." <br/><br/>I went to the chair by Serena's nightstand, took the purse or whatever bag it was off the seat, and scooted it forward. Then I sat in it and took my cock in hand. <br/><br/>Carly, as expected, frowned. She crossed her arms over her bare breasts. "I don't think we should."<br/><br/>"Lighten up," said Vanessa. Then, to me, "What do you want us to do?" <br/><br/>"I can think of several things I want you to do," I said. "But you can sit closer to me, to start."<br/><br/>Vanessa crawled forward on the carpet. "Do you just rub it?"<br/><br/>"Yeah." I gently rubbed up towards the head. <br/><br/>Vanessa was fascinated. "What...things do you want me to do?"<br/><br/>"Well I mean...I was just joking..."<br/><br/>"Like sex?"<br/><br/>I swallowed. "Uh, like sex, but...there's...other things..."<br/><br/>Carly groaned. "Vanessa..."<br/><br/>"Shut-up, I want to know." She looked up at me. "Can I touch it?"<br/><br/>"Yeah," I said. "Oh yeah." I slid my grip down to the base and pointed the bulbous cockhead at her.<br/><br/>She reached forward, tentative. With her thumb and index finger she lightly clutched at the head, and gave a terrified little laugh as it twitched. "Does that feel good?"<br/><br/>It felt amazing.<br/><br/>"Don't," said Carly.<br/><br/>Vanessa ignored her. She slid her thumb and index finger down my shaft, squeezing as she went. "It feels weird," she said. "Rigid, but...soft, springy. I can feel...the veins..." As her fingers slid down they met mine at the base. Then she slid her hand back up.<br/><br/>"There's...something coming out," she said. A light drop of clear precum had pooled in my slit.