A Lesson in Biology
Copyright© 2026 by Lubrican
Chapter 13
Coming of Age Sex Story: Chapter 13 - 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
Gerald Butler, attorney at law, had gotten himself a cherry job at Masters, Hoople and Appleton, which was a law firm that made multi multi millions of dollars making their clients happy. He opened a letter containing a petition informing one Bradley M. Fitts that Molly L. Fitts was suing him for divorce. The petition had been served to Mr. Fitts while he was in the hospital and had been forwarded to Mr. Fitts’ attorneys. He felt a little thrill go through him. He knew that one of their clients was Eugene Fitts, CEO of The Arbeiter’s Hedge Fund Group, who had engaged Masters, Hoople and Appleton to defend his son in a vehicular homicide case. Two associate lawyers had been assigned to gather intel on the case, and provide an avenue which Mr. Masters, Hoople, or Appleton could use to destroy the evidence against the Fitts boy and get him off of all charges on whatever technicalities could be used.
Gerald knew that this was a new wrinkle in the firm’s plans and that Mr. Hoople needed to be advised of the wrinkle immediately. Gerald went to the bathroom, inspected his attire in the mirror, practiced his “I am supremely competent” look, took the tri-folded documents, and went to talk to Cindy, Mr. Hoople’s executive assistant. He hoped to be able to brief Mr. Hoople in person, where his supreme competence would be seen and remembered.
When he got to Mr. Hoople’s suite, Cindy, his executive assistant, looked as cool and distant as ever. Gerald knew that the tongue in that straight-lipped mouth could be as sharp as a Nazi dagger. He had never seen her smile. He therefore approached her with care and tact.
“Good morning, Mrs. Johnston. I have something here that I think Mr. Hoople should see. It bears on an important case he’s taking to trial.”
Cindy looked up above reading glasses that actually looked like granny glasses.
“Don’t just stand there. What is it?”
“I really need to see Mr. Hoople. It won’t take but a minute,” Gerald said, firmly. “It’s a letter concerning one of our important clients.”
“Show me,” said Cindy, holding out a hand that somehow looked twenty-five, rather than the fiftyish that Gerald thought it must be.
He handed her the letter, feeling a little un-manned.
“The client we’re defending in a murder case is also being sued for divorce. I thought it might be a distraction from the main issue.”
Cindy read the petition. She was also aware of how important The Arbeiter’s Hedge Fund Group was to the firm. She stood and said, “He’s very busy this morning, but I’ll see if he can spare a moment. Wait here.”
She took the document behind the ten-foot-high double doors to the inner sanctum of one of the partners of the firm. Gerald was disappointed. He took a mint from the crystal bowl on Cindy’s desk and sucked on it. He looked around, feeling foolish. Anybody who saw him would know he wasn’t important enough to see one of the partners.
Cindy came out of the inner sanctum, handed Gerald the petition for divorce, and said, “Mr. Hoople says for you to make this go away.”
She then sat down at her desk and ignored him.
Molly lifted her head and the suction she had created with the knob of Marcus’s cock in her mouth broke with a pop. She swallowed the rest of the semen in her mouth and wiped her chin, where what had been too much to confine in her mouth had escaped. She stared up at her dark-skinned lover.
“I love doing this so much. Brad’s cock always tastes ... sour, I guess. But you taste delicious.”
“I love it when you taste me,” he panted, stroking her hair. “I’ll take care of you and then I’ll be ready to go again.”
He sat up effortlessly and manhandled her onto her back. He got on his elbows between her spread thighs.
“Hi, Baby,” he said to her flushed lips. “You don’t know how glad I am to meet you. I’m gonna make you feel real good and then I’m going to feed you a snack.”
He buried his face and sucked her vulva as one big item. He speared her opening with his stiff tongue and then found her clit. Sealing his lips around the skin where the little head erupted, he rhythmically sucked, creating pull that lasted for a second, and then releasing the pressure for a second. He repeated that as her hands grasped his kinky hair and pulled as she groaned piteously. He flicked the little organ with the tip of his tongue and her heels pounded the bed beside her hips. She squirted. Marcus hadn’t expected that, but when his face got wet, he licked her split like a dog licking peanut butter off of a spoon.
It had taken a long time to help her cum, maybe ten full minutes. Whatever the time, it had been enough to recharge his equipment and when he got up on all fours his penis hung, long and heavy, bouncing slightly in time with the beating of his heart. He didn’t know if she could tolerate her own juices on her lips or not, so he moved to her nipples and sucked them some more. She had loved that the first time he did it. He nursed, going back and forth until he heard her breathing stabilize. Then he lifted his face and said, “I’m going to make you very happy. I’ve been waiting a long time to do this.”
He gripped his prong and moved his knees so it touched her slippery lips.
“Wait!” she said.
He rubbed the tip up and down her split.
“I’m sorry, Marcus,” she moaned. “I just can’t do it until I’m not married. I know if we do this I’ll feel guilty for the rest of my life. Please forgive me. I want to, I really do, but I know it wouldn’t be the right thing right now.”
He moved the tip away. If he was disappointed or frustrated he didn’t let it show on his face.
“We could go skinny dipping again. We could get off like we did the last time. Would you like that?”
“Yes,” she said, as tears rolled down her cheeks.
He abandoned worrying about her fluid on his face and kissed her cheek.
“Don’t cry. I get it. I love you and I’ll wait.”
She only sobbed harder and hugged him tightly.
They walked out onto the patio in the moonlight, naked. Her skin gleamed under the full moon. All he did was cast a shadow, which was as dark as his outline. They jumped into the shallow end and walked, hand in hand, to a place where her shoulders were barely out of the water and his nipples were almost exposed.
They altered the plan a little. As they kissed, Marcus masturbated her with the head of his penis. She moaned and bobbed in the water, humming and grabbing his skin with her fingers.
“You’re making me cum,” she whimpered. “Please make me cum, Marcus.”
He continued, rubbing her clit back and forth.
When she was in the middle of her orgasm he reached his. He pushed the tip of his cock against her opening just hard enough to make it spread half an inch.
Then he filled her vagina with his seed, which displaced the water in it. One of her hands came to grip his wrist, but she held it steady, rather than pushing his hand and cock away.
“You were naughty,” she said later, as they cuddled in bed, dry again.
“I can’t wait until I can do that deep inside you,” he said. “No, I can wait, but I hope you’ll let me be naughty again.”
They fell asleep naked, knowing that nobody would disturb them. Four hours later Marcus woke up with a raging boner and a dim and fast-fading memory of a dream. He moved and Molly’s voice came to him drowsy.
“What’s wrong?”
“Nothing,” he said. “I just had a dream, that’s all.”
Her hand found his erection.
“That must have been some dream,” she said. “Are you going to ravish me? I’m helpless, you know.”
He pulled her over against him and kissed her.
“I’m not going to ravish you. Not yet, anyway. When you get divorced I’m going to ravish you every day.”
“Mmmm, that sounds nice.”
“How about if I give you a nice orgasm and then be naughty again.”
She kissed his chin in the dark.
“If you shoot your sperm up inside me, you might as well fuck me.”
“It’s not the same. Trust me.”
“It is if you get me pregnant. I have pills but I haven’t started taking them, yet. My life needs to be a little calmer before I do that or I’ll miss a pill, now and then, and if you miss a pill, now and then, you aren’t really on the pill.”
“Could I get you pregnant?” he asked. It was at once a question as to “Is it possible, at this time in your cycle that you could be fertile?” and “Would you let me do that right now?” She heard both questions clearly.
“I don’t know and no.”
He understood her answer.
“Do you think I’ll ever get to make you pregnant?”
“Now is not the time to ask me things like that. I’m emotionally vulnerable right now. You and your magnificent penis are right here, where I could be ravished and might be so foolish as to welcome that. But you know what I need and I trust you to give me what I need, and not necessarily what I might want at any given moment in time.”
“I’ll take that as a yes,” he said. “Some day, we’ll be like this, and I’ll say I want to breed you and you’ll say you want to be bred and it will be a wild night.”
“I know it will,” she said, rubbing her body against him.
“I know what you need,” he said.
“Oh? And what is that, mister smarty pants?”
“I don’t have pants on. We’ll get to that in a minute. Right now, you need a nice orgasm to help you go back to sleep. And after that, since I don’t have any pants on, I will masturbate instead of breeding you.”
She kissed him.
“Thank you. I love you.”
“I’m really glad you do,” he said.
He used his fingers on her pussy and his lips on her nipples and wound her slowly up to a groaning orgasm. Her “I love this so much” got him even harder. He lay beside her and started stroking.
“I don’t have a washcloth,” he panted, gently. “I don’t want to make a mess.”
“You want to be naughty again,” she rasped, still trying to catch her breath.
“Well, isn’t the damage already done?”
“Yes.”
“Are you going to get a plan B pill tomorrow?”
“That’s a personal question to ask a lady,” she said. She reached for his cock and tried to hold it while he stroked. Their hands bumped several times.
“I don’t think it’s too personal for the sperm donor to ask that,” he said.
“I don’t know, yet,” she said.
“But the damage has already been done ... right?”
“Yes,” she said, caressing his face in the dark.
He scrambled up and in between her legs as she spread them for him. She rubbed her clit as he sped up. He couldn’t stroke her with the head of his organ if he was jerking it, so every once in a while he stopped stroking and then got the end of his cock coated with her slippery juices. The tip of his penis ran into her fingers, reversing what had foiled her attempt to hold it while his hand was moving along it, but it didn’t bother either of them. Because her fingers were at the top of her slit, when the blunt tip sank into her vaginal opening and caught there, he could sense it was more welcoming, physically, than Robin’s had been.
“This is what I was doing with Robin when my sister slapped me on the ass and ruined everything,” he said.
“One, you should not be shooting any sperm anywhere near Robin’s pussy. Second, it hasn’t ruined anything. It sped something up, but the overall plan hasn’t changed. She will just know what she’s missing during her entire junior and senior years. It may drive her insane, but you also know what you’re missing when you’re being cut off for being a bad boy and it hasn’t driven you around the bend. I suspect she’ll try to sneak you into her pussy now and then.”
“What if we had structured time, say once a month, when she is least fertile. That, plus the fact that she’s on the pill, would ensure no sperm was actually dangerous.”
“I’ll have to think about that, but not now. Right now, the penis you want to ravish my daughter with on a monthly basis is making me very horny and is much too close to where any sperm you leak could be dangerous.”
“Except the damage is already done,” he said, licking one of her nipples.
“I’m ready for you to be naughty,” she panted.
It was as if she gave him permission and he pushed almost hard enough to cause her discomfort and let loose with a full load inside her vaginal canal. Her fingers were going crazy just an inch above where he was filling her and, as he pulled his penis away, her fingers bumped into it as they flashed to begin shoving her fingers up inside herself, finger-fucking herself rapidly.
“Ohhhh, yeahhhh,” she groaned as she had another orgasm. “Your delicious cum is in me. I love having it in me. Your very dangerous, very naughty African seeds are trying to get into my womb.”
She hugged him tight and kissed him. Then she put her lips by his ear and whispered.
“I’m going to tell my cervix to open up and let them all in.”
They fell asleep again, kissing.
The next morning they got up and showered together. They were drinking coffee in the kitchen when Robin came in the back door.
“Is it safe to come in, yet?” she asked.
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