Awkward energy traveled throughout Lincoln Loud's entire body. The fifteen-year-old was pointedly trying to ignore the brewing tension, and frustration he felt.

For whatever reason, Royal Woods Middle School decided to update their biology curriculum. Opting to combine both, the male and female reproductive systems in their updated course.

They watched ancient educational videos and looked at fuzzy pictures in their books while Mr. Phillips clumsily explained the new information.

Although Lincoln was familiar with the male reproductive anatomy, his knowledge of the female body was shamefully lacking.

To top it all off, Lincoln hardly learned anything from the stupid seminar, and now he was stressing about his grade in the class.

Letting out a frustrated sigh, Lincoln flipped through his textbook and attempted to will the information into his mind.

There was a soft knock on the door, and Lincoln called out for them to come in.

A pretty girl with short curly brown hair, pulled back by a headband, popped her head into the room with a shy smile.

"Room for one more," Cristina teased.

With a thankful sigh, Lincoln nodded. "Come in, I'm pretty sure that I'm going to fail biology."

"Why are you so sure, you're going to fail?" Cristina asked as she walked into the room.

Lincoln eyed his long-time girlfriend with appreciation, Cristina was slender with modest sized hips and a small waist, and a perky set of B-cup sized breasts. God she was gorgeous, sometimes Lincoln wondered what she was doing with him…

Focus Lincoln Focus! Rubbing his eyes, Lincoln looked down at his notes scornfully" I didn't learn shit, in that seminar...I don't know why they picked the most boring teacher possible"...

Cristina took a seat next to Lincoln and patted him on the shoulder sympathetically" Don't think like that Lincoln…"

Lincoln raked his fingers through his hair as he gritted his teeth in frustration" my notes are shit"...

Cristina reached for Lincoln's notes and wrinkled her nose at his messy hand writing, and lack of organization " ohhh, Lincoln…well you weren't wrong, you're notes are shit".

While Lincoln let out a long sigh, while Cristina thought over the situation. She blushed hotly as a naughty idea crossed her mind.

While she and Lincoln had been dating, since the beginning of middle school...they had yet to take their relationship to that next level...and after the seminar Cristina felt a burning curiosity.

The attraction was definitely there, Lincoln was about six feet tall after a recent growth spurt. His body was lean, with compact muscles.

His hair was loose around His face giving him a boyish charm. If Cristina looked closely she could make out the faintest dusting of freckles covered the bridge of his nose as well.

Gone was the shy boy, she had started dating after they were pared together in social studies. And in his place was a handsome young man…however this only furthered Cristina's curiosity.

Did boys really look, the same way they did in those textbooks? How big would Lincoln be?

Lincoln pouted at Cristina" Hey!? Are you even listening, this is my future we're talking about"...

The duo enjoyed a laugh together until Cristina cleared her throat " What if...I gave you a tour, on a live specimen..."

Lincoln quirked a brow" What do you mean"?

Looking at her black slip-ons, Cristina giggled nervously while her face burned" ...I mean….that...I could show you what a woman's body is supposed to look like...obviously in the name of science...and that's if you would be willing to do the same for me"...

It was now Lincoln's turn to blush as he looked at his girlfriend incredulously, was Cristina offering to get naked for him? The thought alone sent tingles down Lincoln's spine, awakening his slumbering cock.

Schooling his expression, Lincoln attempted to hide his intense interest " Yeah...I think it would be quite educational...as long as long as you're comfortable"...

Nodding, Cristina stood up and fingered the buttons on her blouse while Lincoln sat rooted in his spot, his eyes following Cristina's hands.

With a hint of shyness, Cristina slowly started to unbutton her shirt until. She could feel Lincoln's eyes tracing each inch of newly uncovered skin.

Honestly she couldn't believe she was doing something so bold, however the look or pure adoration on Lincoln's face made her core ache.

Hesitantly Cristina slipped the straps down her shoulders, before she undid the clasp of her bra.

Lincoln's eyes widened as he ogled Cristina's creamy bare breasts. Her mounds were firm and perfectly rounded, while her rose colored nipples hardened.

Below Lincoln's erection strained against his zipper, he was rock hard and twitched as it got impossibly harder.

Cristina's breathing hitched, when she fingered the hem line of her skirt. She slowly pulled the garment down her hips, allowing it too pool at her feet.

"...You're so sexy Cristina, every inch of you're body is perfect", Lincoln murmured in awe.

Cristina blushed at Lincoln's words, her heart was beating like mad while she stood mostly naked before her boyfriend. The only shred of clothing she was wearing at the moment were a pair of white cotton panties.

Warm heat started building up in, Cristina's lower abdomen as her eyes focused on the prominent bulge in Lincoln's jeans.

Cristina felt herself moisten, she couldn't help but wonder what Lincoln's cock would look like...He looked big, that's for sure.

"Should I keep going?" Cristina whispered tentatively.

Lincoln nodded vigorously, "Yeah... If you want to..."

Exhaling the brunette slipped her panties down, allowing them to pool at her feet. Lincoln's eyes widened and, his face became even more flushed.

The front of his jeans jerked as Lincoln's cock rubbed against his zipper. Cristina looked beautiful... Lincoln's eyes devoured the sight greedily.

Cristina had a small patch of brown curls right above her delicate lower lips. Her skin was a dusky pink, almost reminding Lincoln of a flower petal. Hidden betwixt her pinkend lips was a cute little nub, that made Lincoln's mouth water.

Without thinking Lincoln, moved to stand up. His erection stood proudly, pointing towards Cristina." ...You...look, beautiful"...

Blushing furiously, Cristina eyed Lincoln. "Now it's your turn... Take your clothes off."

Lincoln didn't need to be told twice. He was pulling his shirt over his head and shoving his jeans and boxers down within a matter of minutes.

Cristina's eyes roamed over Lincoln's lean and compact upper body, leading towards his narrow hips and stopping at his apex.

Lincoln's cock was thick, with the base dusted with fine white hair. He was long—at least six inches when hard—and it was curved deliciously to the side.

"That's just…wow", Cristina stuttered.

Looking back towards Cristina, Lincoln raised an eyebrow when he noticed that Cristina was staring wide eyed at his manhood.

With a sense of pride, Lincoln subtly flexed "Well... what do you think"?

Cristina's mind seemed to go blank, and all she could think about was wrapping her hands, mouth, or pussy around that huge piece of meat.

" I...want it", Cristina answered without fully thinking.

Impulsively, Lincoln reached forward and crushed Cristina to his body. Cristina's breasts mashed against his chest as the teen's traded feverish kisses.

Cristina sucked and licked at the corners of Lincoln's mouth while his hands freely roamed over Cristina's bare body.

Dropping his hand, Lincoln grabbed a handful of Cristina's round ass. The brunette was rocking her hips against Lincoln's thigh, grinding her molten core against him.

Lincoln picked Cristina up, and she instinctively wrapped her legs around his hips. Lincoln's cock was rubbing between her slick thighs.

Reaching between their bodies, Cristina guided Lincoln's cock head towards her opening.

Biting her lips, Cristina slowly lowered herself ontop of Lincoln's cock. His legnth sinking inside of her virgin insides.

Lincoln held Cristina up while the brunette's body clamped down around his cock unmercifully. Warm tears pooled at the corners of Cristina's eyes, and Lincoln peppered her with encouraging kisses.

" You feel, so good baby...I love you Cristina", Lincoln moaned.

Taking a deep breath, Cristina slowly rocked her hips against Lincoln's, slowly starting to ride his cock. "I love you too, Lincoln... I can feel you so deep inside of me."

Warm pleasure bubbled in Cristina's pussy as Lincoln proceeded to pummel her. His cock rasping against her sensitive insides, and making Cristina's toes curl with each orgasmic thrust.

Pushing Cristina against the wall, Lincoln pushed up her legs effectively pinning her to the wall as he increased his pace.

Pleasure drunk, Lincoln was obvious to the knocking at the door. Cristina was massaging his legnth, her silken insides threatening to push him over the edge.

Throwing his head back, Lincoln felt himself cumming harder than ever before. Filling Cristina's womb with his warm cum...