A Lesson in Biology
Copyright© 2026 by Lubrican
Chapter 6
Coming of Age Sex Story: Chapter 6 - She wanted to be a cheerleader but her grades were too low. Summer school might solve that problem. But she needed a tutor to make sure. Her mom got a name from the school and he was hired. When they got to the biology tutoring, she wanted to understand the reproductive system. He was happy to teach her about it.
Caution: This Coming of Age Sex Story contains strong sexual content, including mt/ft mt/Fa Mult Teenagers Consensual Heterosexual Fiction Incest Mother Son Brother Sister Harem Interracial Black Male White Female First Lactation Masturbation Oral Sex Petting Pregnancy Voyeurism
As emotional as all three of them were, it was decided that Marcus should go home so everybody could calm down. His only request was to be able to kiss each of them good night.
He kissed Robin first. Their passion made Molly perk up.
“You’ve done this before,” she said, firmly.
The kissers pulled back and looked at her.
“You could not kiss like that and never have kissed before.” She didn’t sound angry, but she sounded like she wanted an answer to the unasked question.
“We did kiss a few times when he was leaving to go home,” said Robin, carefully.
“What else did you do a few times before he was leaving to go home?”
“Can we talk about that after he’s gone?” asked Robin.
“Truth and honesty?”
“Truth and honesty,” Robin sighed.
Then Marcus kissed Molly. He was just as passionate with her and it unleashed the passion she had kept in check all evening. The climax she’d had in the pool had helped, but it was a paper cage surrounding wild stallions. As the kiss deepened and their tongues dueled, his hand came up to cup one of her breasts. She did not make him stop. Instead she arched her chest. When the kiss ended, they pulled apart slowly, reluctantly, and stared into each other’s eyes.
“Get out,” she said. Her voice was flat.
“Yes, Ma’am,” he replied.
Without fanfare he went to the front door and left the house.
“Why did you tell him to get out like that?” asked Robin.
“Because that kiss made my panties absolutely wet,” said Molly. “If I hadn’t made him go the timeline for things would have advanced way too quickly.”
“You mean you would have slept with him,” said Robin.
“I mean I would have slept with him,” Molly muttered.
What had transpired thus far might make the unbiased observer expect for there to be a lot of sex ... without the kind of thing most observers would identify as “sex”. That’s not what happened.
What happened was that Robin confessed to the foreplay she and Marcus had engaged in. When Molly heard that her daughter had gotten her pussy fingered, and then had hot semen on her body, it was clear the boy could have forced things or advanced things. But he hadn’t. And he hadn’t made her agree that intercourse would be the end of the foreplay game. He could have seduced her all the way. That kiss and his bare touch to her breast just before he left made Molly absolutely sure Marcus Wilmington could get his great big cock in their tight pussies whenever he wanted to. He could use them both. But that’s not what he did.
When all was confessed, Robin asked, “Are you mad?”
“I can’t be mad at you for being normal,” Molly said. “I think you owe me, though.”
“What do you mean?”
“Well, what I had in mind for you was to be the observer while Marcus and I exhibited things. You have jumped ahead and I think I should be allowed to catch up before you go farther.”
“You want him to do those things to you?”
“I want him to do them with me ... not to me. Do you understand the difference?”
“Yes,” said Robin. “I will try not to phrase things wrong in the future. So while you are catching up ... can I watch?”
Molly raised her head and looked down her nose at Robin.
“Do you know the word ‘voyeur’?”
“I don’t think so.”
“Well, go look it up and decide what you want it to mean in your life.”
“Can’t you just tell me?”
“Of course I could, but if I make you look it up it will mean more to you.”
“Okay. I think I’m going to bed,” said Robin.
“We’ll order you a Bob tomorrow,” said Molly. “I only have one and I’m not going to share it with you.”
“What’s a Bob?”
“It means Battery Operated Boyfriend,” said Molly.
“Oh!” Robin blushed. “You mean a ... toy?”
“Yes. You always loved playing with your toys when you were little. I think you’ll want to play with this toy a lot, too.”
When Marcus got home he hugged his mother tightly.
“I love you,” he said into her hair.
“I love you, too. I’m going to need you tonight,” she said.
“I’ll be ready.”
“How’s it going with the white girl?”
“I’ll tell you later ... in bed.”
“All right. Have you eaten?”
“Yes. Mrs. Fitts fixed us a late dinner. It was kind of a picnic. It was good.”
“Hmmm. Do you think she’s worried about her daughter?”
“No. She’s not worried. If you’re ready, let’s go to bed and I’ll tell you about it. I have a boner that actually hurts.”
“A boner you brought home, or one you got since you got here?”
“I brought it home,” he said. “But I want to use it with you. Now, do you want to make love or sit around grilling me like a detective?”
“I want to use that boner,” she said.
Delores Wilmington was thirty-three. She walked religiously at the high school track in the evenings. She liked to go hiking and a fifteen kilometer trail didn’t scare her at all. She had let her hair grow out into what some people called an “Afro” and she loved it, even though it was a pain to keep fluffed. She had to pick it every day, several times a day. She had even learned how to sleep on a pillow just so, so that her fro kept its basic shape.
She could not, however, keep things shapely when Marcus was making her crazy. He had all the good qualities of her son-of-a-bitch husband, and none of the bad qualities. When she broke down and asked him for an incestuous relationship he had been kind and loving. He had continued to be kind and loving to the point that she wanted her daughters to experience making love with a kind and loving man, too. The girls knew they would be expected to transfer their passion to other men, when they grew older, but Delores planned to keep making love with Marcus as long as possible. When he got married, she hoped she’d be able to arrange it so he could sleep with her, occasionally.
Now, after having four orgasms with Marcus’s perfect penis in her, she rolled them over and relaxed, just sitting, impaled, and looked down at him.
“Now, tell me,” she said.
When she heard what had happened she had a double reaction. First was fear. What Marcus had already done would not fare well in the opinions of most people, both black and white. Mixed race relationships could work, but they were fraught with anxiety and danger, at least until there was a marriage. Even then there were many who would imagine them “together” and be angry. The age gap between Marcus and the mother was too big to bridge. The girl was too young and would be too young for at least two years. A lot could happen in two years. Would he go there and behave, generally speaking, like he did at home? If he did, she had no doubt that both women would fall in love with him. What if one of them got pregnant?
That made her think of the black seeds Marcus had planted in her within the last half hour. She wasn’t protected. Tonight had been an emotional need for unknown reasons. She hadn’t planned it. She hadn’t looked at the calendar she kept on the wall that documented all three of the Wilmington women’s menstrual cycles. She imagined one of her son’s sperm cells already punching her egg, trying to get in.
If she got pregnant, she could live with it. If one of those white women got pregnant, could they live with it, too?
“I want to meet them,” she said, as she started squeezing the penis inside her. She knew she could make him cum if she squeezed and released just so.
“Why?” he panted, as he reached for breasts that had fed three children and still didn’t sag. He pinched her nipples, which made her pussy milk him even faster.
“I want to ask them what they’ll do if you breed one of them.”
“You can’t do that, Mom,” he groaned.
“I certainly can,” she said. “This could have a huge impact on your future, and I don’t want some horny white woman to ruin that future. I want you to have all the options you have now.”
“You know we can’t afford to send me to college,” said Marcus. “I’ve put in for some scholarships and I have the grades and all that, but there are only so many slots and three times as many people who want one. I may have to go the community college route, which will be a waste of my full potential but will at least let me get into the work force so I can work my way up.”
“You’ll figure that out,” she said. “Cum in me, Baby. I want to feel you cumming in me, again.”
There was a five minute pause while both of them climaxed and kissed each other a few dozen times. Then she sat back up. He was soft, but still in her.
“These white women could get you killed,” she said.
“This isn’t the old South, Mom,” he said.
“It doesn’t have to be. Suppose this husband of hers finds out about you. He’s rich and powerful. You could be made to have an accident. That gang over in the old industrial area would be quite happy to take money and then come do a drive by when you’re walking.”
“I think you’re being a little dramatic,” said Marcus.
“Maybe I am and maybe I’m not. All I know is I only have one son and I love him and need him to be safe. If you died, a piece of me would die with you, and I am only made up of three pieces.”
“How will you meeting them make things better?” he asked.
“I’ve dealt with lots of white people and most of them are easy to read when a black comes into the room. I want to see how she reacts to me.”
“Why would she react badly to you if she isn’t even anywhere close to reacting badly to me?”
“I know what I’m doing, Marcus,” she said, her voice becoming harder. “I want to meet them.”
“Okay. Let me see what I can do.”
Delores lay down on his chest again. She kissed him and nuzzled his neck.
“If you weren’t my son I’d marry you,” she murmured.
“You do realize that would make you a cougar ... just like Mrs. Fitts said people would see her.”
“You are my son. And if you marry the girl you’ll be her son-in-law. Based on what you’ve told me, you’ll have unfettered access to her.”
“Nobody’s talking about marriage. That word never came up.”
“Trust me. If you breed that girl, the word will come up.”
“I think Molly said she was going to put Robin on birth control.”
“So now it’s Molly? You already call her by her first name?”
Marcus rolled them over and lay fully on top of her. He knew he was heavy but he lay there anyway.
“Woman,” he said, softly. “If you keep nagging me I’m going to look at your calendar and fill you with my strong, African seeds and breed you!”
She managed to make them roll onto their sides.
“You talk big, but your black cock is as soft as a marshmallow.”
“Does that mean there’s nothing left for me?” came the voice of Tasha, his sixteen-year-old sister.
“I thought I told you not to watch us,” grumped Delores.
“How can I learn things if I don’t get to see things?”
“He’s mine, tonight,” said Delores, firmly.
“Okay. I can wait until tomorrow night. It will still be safe.”
“All right, then,” said Delores. “Now go on and close the door after you.”
“I just have one question,” said Tasha.
“What?” asked Delores, in an annoyed voice.
“How come you’re making love with Marcus while you’re ovulating?”
Delores stood, naked, peering at the calendar she hadn’t looked at before she asked her son for sex. His semen was running down the inside of her right thigh.
“Oh, no,” she moaned.
Marcus stood behind her, looking over her shoulder. The calendar was covered with different colored notations, in a code only the women understood. That calendar was supposed to be consulted before letting Marcus spurt in them.
Marcus pressed his front to Delores’ back and reached around to cup her breasts.
“Do I need to go buy a Plan B pill?” he asked.
“You know we can’t afford that kind of thing. We don’t have forty-five dollars just lying around.”
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