Anatomy Lesson

by Losgud

Caution: This Erotica Sex Story contains strong sexual content, including Ma/Fa, mt/ft, Consensual, Cheating, Incest, Brother, Sister, First, .

Desc: Erotica Sex Story: Boy starts getting lucky with his girlfriend, and is thus observed. So boy starts getting doubly lucky, with his older sister. They of course both grow up and go on to have separate lives. But still they intersect. As always, enjoy! My apologies of course in the endnote.

It still felt like summer, but school was back in. So, being a Saturday, the day was again special. What could be more special than the weekend?

Not long after lunch, Mom and Dad left to spend the lovely afternoon golfing with the Petersons. Not long after that, a horn was honking like girl power out front of the house. My older sister, Megan, had already explained all that to Mom and Dad over lunch. She was going out with Tiffany and Heather, hitting the Mall, and then a movie, and then really count her out for dinner. Maybe they'd see another movie after that. If she was getting close to midnight curfew, she'd call.

Once I heard the squealing girls squealing away, I picked up the phone. I called Lizzy's house. Every time I called, I'd be afraid about who I'd have to talk to first. Her dad scared me, but at least he didn't like to waste his time. After about twenty seconds of grilling me, he would either hand me over to Lizzy, or just hang up. Her mom was freaky at the other end of the scale. She'd engage me in conversations that could go on for twenty minutes. On several occasions, I was the one to politely end the phone call. Sometimes I got rewarded with Lizzy's eventual voice. Other times, it became obvious that she could chat all day, determined to not let me talk to her daughter. This time, thank god, the line picked up in one ring, and it was Lizzy. Like she was waiting for me.

"Hello?" I inquired most politely, "This is Ben. I'm calling for Lizzy, if she's available."

"Hi, Ben," she oozed.

"Hey Lizzy, what's up?"

"Just sitting here at home annoyed by my family. So good to hear your voice. What's going on with you?"

"Same as you. I'm just sitting at home. Except all my annoying family went away guaranteed all afternoon."



"And... ?" she whispered.

"I'm all by myself and sort of bored. I was wondering if maybe you'd like to come over and study with me."

Lizzy gave her cute little giggle that just set my hair on end, in anticipation. "So what subject should we concentrate on?"

"I definitely want to learn more about Anatomy."

"Really? Hmm, that could be most interesting. Lemme ask my mom, and I'll call you right back."

The phone rang back within minutes. I picked it up about to say something naughty, when her mom said, "Hello Ben, may I please speak to one of your parents?"

I about fainted. But then I just started lying. "Mom's at the supermarket because she forgot something for dinner. Dad's out mowing the lawn. May I take a message?"

I heard her give a good sigh. I was a very polite boy. She went on a different tack. "Lizzy tells me you invited her over to study?"

"Yes, ma'am."

"But it's a beautiful Saturday afternoon! And I'm wondering why you two want to huddle inside and study?"

"You're telling me! But this Biology course we're taking is really hard. We're in this subsection now on anatomy. We've learned that the body has hundreds of bones, and muscle groups, and they all have Latin names, and for the section final we have to memorize them all."

"Oh, ick," she said. "Lizzy will be over soon to help. Just make sure you help her back."

"As always," I announced.

Our secret was that we'd been having sex for several months. I'd just turned fifteen while Lizzy was finishing up fourteen. We were both virgins until the first time. It happened almost by accident; neither of us was expecting it. We just got left alone for several unanticipated hours. The last time that'd happened was the best. I got Lizzy to lift up her shirt and let me play with her pretty little boobies.

"I know they're small and all," she whispered, "but they like to be touched. But nobody other than me has ever touched them before."

"It doesn't matter how big they are; all that matters is how beautiful they are." I was a boy, but I was a smart boy. And I was just speaking the truth. As I touched her, as I dared to suck on her ... until a car pulled in the drive and Lizzy yanked her shirt down and pulled away down the sofa as we pretended to be watching t.v. I had to talk seriously to her parents while sitting funny to hide the effect their daughter had on me. Her mom stared and searched my eyes, making me get even harder in my discreet positioning.

I had to stay awhile to let my presence be lessened. Her mom fetched me a soda, and I stayed through that, trying to kill my hard-on enough to stand up and go home. Stand up in front her parents, her oddly eyeing mother.

Finally I was let loose back home. I endured the gauntlet of my parents, and then, thank god, my big sister Megan wasn't home to toss in her own barbs. She was out on a date or something, keeping our parents up late. I left them at their watch, seated in the livingroom. I brushed teeth and went to bed relatively early for me.

My thoughts were that there was no one in the bedroom wing of the house to hear, making it safe for me to jack-off like crazy. I kept focusing on the visual of Lizzy's tits. But then her mom's eyes looking at me kept creeping in. I kept imagining Lizzy giving me blow-jobs, while it would be her mother's fingers tickling my balls that made me launch. I rested a bit, nearly falling asleep, but then started jacking-off again.

For some reason I was thinking of my sister. Probably because of the thrill of knowing that if Megan knew, she would kill me. The sound of voices and several bedroom doors being closed delayed me, but then I finished again, oh so quietly. But quite copiously!

Left alone again at a later date, we began a repeat, on the very couch, but then Lizzy shrugged away and stood up. I was startled, but then she yanked down at my hand. "I want my first time to be in my own bed." I stood up, rising to my feet because my cock was pointed down in my pants and was pushing me up from the sofa.

Nature's lift, it's called.

I thought to just follow Lizzy to her room, but then I thought better to move up beside her, slip an arm slung low around her waist. "Are you sure?"

Lizzy stopped us, mid-hall, turning to kiss me like crazy. Like an alien trying to eat me from the inside out. That sensation was sexier than expected. "I've never been more certain of anything in all my life."

As we moved into her room, I got over being scared. Lizzy turned down her bed and then faced me. "Let's just get naked and fall into bed and roll around like two naked virgins, and see what happens next?"

I quickly decided I liked a practical gal!

After the rolling around part, we skipped the other appetizers and went straight to dessert. I'd barely gotten to slide my fingers between her slippery lips down there when she reached around under her mattress and pulled out a condom.

We really didn't know what we were doing, other than her thinking of protection. We made my penetration so slow and gentle. We both gasped at the initial sensations. It was like discovering the best secret in the whole world. But quickly that approach encountered a barrier. No matter how horny I was, I didn't want to hurt Lizzy.

She noted my hesitation. "I'll be brave, I promise. Ben, I want you to be the one."

I lathered her with kisses, distracting her playing with her boobs, and then I pierced her without warning. She screamed some bad screams, and then I collapsed, crying and apologizing. I didn't want to hurt Lizzy.

I lay there in her arms feeling so crummy and almost evil. I was still inside her, but shrinking. Until her insides suddenly gave me a squeeze. I was confused, until it happened again twice fast like code, deciphered by Lizzy's giggle.

"It really hurt at first, but now, hmm-mm, it feels really good." Lizzy began moving beneath me, enjoying what we were doing. "Ben," she glittered, "we're finally fucking. Ten minutes ago we were virgins. And now we've become lovers."

Despite the rubber numbing I was so fast to blasting. Lizzy sensed that too. "Go on," she urged, "just give it to me."

The only surprise was that when I started doing precisely that, Lizzy started screaming some good screams.

Afterwards we melted onto our sides, face to face. I was feeling drowsy while Lizzy was all alive. It was like she'd siphoned off my energy. She kept giving my tired face little nibbling bunny kisses. "I didn't expect that to happen," she whispered all giddy in my ear, "not the first time."

I kept trying to doze a little but she kept squirming, until she bounced out of the bed announcing she had to go pee. But first she leaned down beside me and delicately picked up the spent condom to flush away as well.

When she returned, she crawled back into the bed and sort of clambered on top of me, draping me like a quilt. But one with a chin up and chirping, "Hope you don't mind, but now I'm totally in love with you."

"Lizzy is my girl," I sputtered, trying to rein in the typical guy reaction.

Lizzy gave me a coy look. "I didn't know what to expect. That was the only condom I have." She tossed her head, her beautiful head of hair. "So maybe it's time for me to start learning about blow-jobs, right?"

Well, one guess how that went. I had two tepid suck-offs under my belt, and was shocked how Lizzy dove right in, loving blow-jobs almost as much as me. She didn't really know what she was doing, but boy was she enthusiastic. And an intuitive learner. It didn't take her very long to have me exploding in her mouth.

She curled up against me and kissed me with her spermy breath. "I hope I did okay," she said in a hush.

.... There is more of this story ...

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Story tagged with:
Ma/Fa / mt/ft / Consensual / Cheating / Incest / Brother / Sister / First /