Nana walks Gary's dog home.

That afternoon in the van, Gary sat beside the full-figured older woman with his legs facing away, leaning back over her lap with his face turned toward her as he sucked her breast. Her graying blonde hair was braided on the sides and tied into a thick rope that ran down her back. She cradled Gary's shoulders with one fleshy arm while stroking his cock with her left hand. She worked in long, firm strokes, sliding the foreskin on and off his prominent cock head.

"That's right, sonny, suck Nana's titty while she walks your doggie home," she said.

Gary moaned into his grandmother's large, soft breast as she stroked his cock.

"I'm glad your mama didn't let the doctors cut your weenie," Nana said. "I love making that little skin slide on and off, on and off."

Gary groaned with pleasure and took a deep breath. "That feels really good, Nana," he said.

"How many girls have you had on this beautiful weenie, sonny?" Nana asked as she kept stroking her grandson's cock.

Gary panted as he counted mentally, Meg-Sharon-Sonia Rubin-Betsy Wilder-Bernie. "Five," he said. "Five girls."

"Pretty good, sonny, sounds like you're doing fine." Nana said. "Not all at once I hope. Your daddy sometimes had trouble with that."

"N-no," Gary said. He hadn't really been doing it with more than two women at a time, really, and that was mainly because of Sonia. Miss Wilder had only been that one time, and only because she and Peter Walker invited him to join them.

Nana gave him a sly look. "How many men you had on your stick?"

"Nana!" Gary protested.

She stroked more slowly. "I felt your pecker jump, don't lie," she said. "How many young men have you drilled, sonny?"

"T-two," Gary said.

Nana stroked Gary's penis slowly and steadily, giving the firm shaft a squeeze every once in a while. "Pretty average for a healthy young man from our family," she said.

Gary raised his eyebrows. "Our family?" A clear drop oozed from his penis.

Nana explained, "Back where your family's from, your mama and daddy both, it used to be that some boys'd bend both ways till they got a steady girl. Your daddy and his brother would sneak off to some corner together for 'shooting practice' if they got stuck without dates on a Saturday night."

Gary opened his eyes wide, thinking of his dad and Uncle Ned.

Nana kept stroking Gary's wiener. "It's the truth, your grandfather and I caught the boys at it more than once. Screwing ass, usually. I'm sure pretending we didn't notice helped keep 'em out of trouble. At least it kept 'em off those damn dangerous mountain roads in bad weather."

She squeezed again and Gary moaned, distracted by the wonderful sensation. Clear fluid leaked gently from his cock tip.

Nana hugged Gary with the arm round his shoulders and kissed him on the top of his head. "Take good care of yourself, sonny, you're my only grandson so far. You want my titty again? I think your doggie's ready to walk on home." She took her hand off Gary's weeping cock and offered him her big, soft breast. As Gary sucked it in, his penis jumped with excitement.

Gary felt her warm hand close around his erection and spread his pre-come around, slicking his juice over his head and shaft. He leaned into Nana's soft curves and sucked harder, whimpering into her titty when her hand touched a sensitive spot.

"That-a-boy, let Nana take you home, honey," she said. She felt Gary's penis start to swell rhythmically in her hand. "There you are, there you are, give it up, honey."

Gary felt the throbbing, with a bigger impulse building inside. He held himself tightly to Nana's soft warmth as the glow of pleasure spread from his cock outward. Gary's hips tilted and he stabbed his cock up into Nana's hand. His groan of climax was muffled by Nana's breast as he writhed in her grasp, coming, shooting white ropes of come over her hand and arm, splashing onto his belly. A pearly drop clung to her wedding ring as she gently kept stroking, looking down at the beautiful, potent young man her son Hank had sired and raised to manhood. As his penis slowly ebbed, she eased off into cupping her hand around the softening member.

"I love you, Gary," she said.

Gary breathed in, shuddering with the after-twitches of orgasm. "I love you, Nana," he said.

"You be good to Miss Big Britches, you hear?" she said.

"Yes, Nana."

Minutes passed as they sat holding each other, warm body to warm body, in the back of Stuart's Super Surf Van. Neither of them noticed Bernie slip away, as they hadn't noticed her presence.

Gary came back to the present, his face flushed. His recently spent cock was stirring again as he looked across the Bernsteins' living room at his girlfriend's mother, as nude as himself but not as visibly flushed from her orgasm. He breathed deeply. It was the second time Joyce and Gary had masturbated together, just the two of them.

"I was sincere about inviting your Nana over," Joyce said. She looked evenly at him. "The back of a van can hardly be comfortable, safe, or discreet."

"I'm betting that was just once in my life that, um, my grandmother, um, masturbates me," Gary said, trying to use Joyce's preferred term. He paused to take a deep breath. He wasn't so sure, actually, what would happen if he and Nana spent time alone together again. "So, um, I don't expect I'll be able to share it with Bernie. But I'm sure Nana would love to meet you and Bernie. After seeing Bernie's picture and hearing about her from me, she's rather partial to your daughter. Nana's got a generous soul, if she likes Bernie, I'm sure she'd like you too. But she and my grandfather are off traveling round the country now."

"You can introduce us to them when they come round for a visit," Joyce said. "But you and Bernie should have a heart-to-heart. She wants to know why, or at least how you came to be in the back of a van with your grandmother masturbating you. And there's a reason she asked to be there when you and your Nana do it rather than telling you to go away."

Gary was dizzy with the intensity of it all. He was glad to be sitting down. "A reason?" he said. Something clicked. He looked Joyce straight in the eyes. "You and Bernie don't just masturbate together," he said. "You masturbate her."

Joyce made a tiny nod.

Gary's cock was fully erect again. His heart pounded. He swallowed and took a deep breath. "I'll tell Bernie everything about me and my Nana. You too. Not that much to tell. I was staying there for a while when my grandfather was away. We always got along well, and we liked to talk with each other about things. So she caught me looking at her old nude pictures and masturbating, and told me her house was too small for me to hog the bathroom so many times a day. She told me just to do it on the back window seat and not worry. And then she was talking to me when I was doing it. She's a real talker, persuasive too. And then she'd even sit with me sometimes, holding my hand, if I was talking about Bernie. And that day in the van. I can't, I mean I can't really explain it. Why, anyway. We were talking about me and Bernie and she was asking me if the sex was good and stuff. She worries about me after Sharon. While we were talking I got really turned on and couldn't just relax and let it go, so she said maybe I should masturbate in the back of the van. So we got in and we talked some more, and, well, things got to where Bernie saw us."

Joyce nodded to acknowledge Gary.

"Let me borrow your shower before Bernie gets home," Gary said.

"Sure thing," Joyce said. She rose from her chair. "Let me get you a towel."

"I promise I'll talk with Bernie about me and my Nana," Gary said. "I'm just wondering if when we talk, you should be there too."

Joyce looked at Gary and didn't say anything. She turned to the closet and fetched a towel for Gary, and made sure he had what he needed for a shower.

About twenty minutes later, Gary felt a draft in the swirling steam. He looked round through the transparent shower curtain and saw his girlfriend peeking through the bathroom door.

"Can I come in and say hi?" Bernie asked.

"Sure," Gary said.