Hiro decided to go to the University's library. He had no reason to be there. He just needs to get rid of the accursed thoughts from his mind. He strolls past the shelves of books, halfheartedly looking at some of the books' titles. Lo and behold, he met a familiar face.

"Good afternoon, Honey Lemon."

"Oh?" She looks up from a book she's reading. "Oh Hiro!" Honey Lemon exclaimed but kept her voice down. "What are you doing here?"

"Well just taking a break. Thought I'd swing by the library."

"That's good. Even a boy genius like you is still human in need of a rest."

"But what about you?"

"I'm just looking for some chemical references for my project. Seems I'm having trouble looking for what I need though."

"You need any help? I'm not doing anything anyway."

"Say... That's really helpful of you."

And thus Honey Lemon and Hiro search high and low for the book. There was nothing on the top case so he knelt to look at the lower shelves.

"I found it. Nope not this one. You said Volume 6, right?"

"Yeah." Honey Lemon replied. Hiro look up. He found her being absorbed on another book.

Even your view towards Honey Lemon might indicate you have a sister complex, that you are in love with someone that is older than you. The words of Baymax interjects into his train of thought suddenly. Before he could wonder why, his puberty strikes again.

His eyes stared at her mesmerizing eyes. He then look at her red pout lips. He can only imagine her big sister lips on his little brother lips... tongue spiraling on each other in a French kiss.

His eyes drinks in her tall slender figure. Her petite breasts, smaller compared to those he seen in porns but he didn't mind. Her long soft legs just stretches on to her fine hips. His eyes strips away her miniskirt and can only imagine her big sister vagina in between.

"I think I found it." Honey Lemon's words shocks him back to reality. He quickly stands. At the same time Honey Lemon turns around. Hiro's temple collided with the hard cover of her book.

"Ow!" He wasn't exaggerating his pain. That hit him pretty hard.

"Oh my gosh! I'm so sorry, Hiro!" She quickly massages the affected area. She was focused there. But Hiro was focused on her face. She was so close. She was so beautiful.

"Thanks, honey..." That gratitude made her look at Hiro strange. "I... I mean... Honey Lemon." He quickly looks away, but Honey Lemon brings him back by the chin to look at her eye to eye. "I don't mind you calling me honey... Or Big Sis Honey." She moves closer and kissed his bruised temple. Once. Twice. Thrice.

"Honey Lemon..."

"Yes?"

"What are you... um..."

"I'm kissing to make it better. You don't like it?" She moves lower and kisses his cheeks.

"But we're in the library..."

"People hardly comes to this section." This time she kissed him on the lips. A quick and affectionate peck. "I've always wanted a little brother that I can pamper."

"Honey Lemon..."

She hushed him. "Big Sis Honey." She kissed him again. "Please call me big sis, Hiro. Just once."

"Big sis."

"Oh little brother..." She unabashedly held him in her embrace. Having a huge height differance, his head only reached up to her chest. He can feel her warmth and beating heart. Is this what having an older sister feels like? Except she is not his older sister. She is someone else. That mere thought gave him an erection.

"Oh my... You're getting hard..."

"S... Sorry..."

"Hush you. There's nothing to be sorry about. As your big sis, it falls to me to teach you all about girls..." She takes off three buttons and takes Hiro's hand. She slips it into her shirt. "Can you feel it? Touch my breast."

In his eagerness Hiro squeezed hard.

"Ngh~" She moaned. "Most girls don't like you doing that... You have to be gentle with your touch. Be more gentle."

Hiro starts to grope, gently kneading her breast in circular motion. Honey Lemon's breath becomes more labored and lets out a series of soft "Oohs" and "Aahs". Even her moans spurs his libido to newer heights.

"Big sis... " Hiro looks up at her with pleading eyes, his hips involuntarily thrusting forward, prodding her thigh.

"Heh... So eager..." She leans her back against the bookshelf and slowly lifts her miniskirt. Her pussy was in plain view. She wasn't wearing any panties. It was wet with anticipation. Hiro struggles desperatedly to take out his dick. He was so excited that he thought he would never get his fly down. She let him struggle a bit more, then she reached down, moved his hands aside and pull down his fly and takes out his dick in two swift motions.

He pushed and rubbed his cock on her. He felt the coarseness of her pubic hair against the soft skin of his penis and it electrified him. He was trying to penetrate her but kept missing the mark. Honey Lemon pushed him back and grasped his throbbing organ in her hand, then guided him into her. She was so wet that he slid into her with ease. She moaned in response.

Despite the wetness of her vagina, it was tight and muscular and held his penis like a vise. "Ooh, Hiro." She cooed and holds him closer to her. Hiro pulls out a little before plunging back into her. There were butterflies in his stomach.

"Yes little brother..." She whispers to his ears.

"Akhnn..." Hiro moans through her sweater as his face still planted in between her twin valleys. He tries to fuck her deeper but the awkwardness of their position and apparent height difference made it a challenge. He had to stand almost at the tip of his toes for each thrust.

"Shhh... Slow down little brother and take your time... Big sis isn't going anywhere..." Sensing his plight, Honey Lemon lowers herself to ease his burden.

"Ahh... big sis..." Hiro did not heed her words. He presses his advantage and fucks her pussy faster than before. Sweat rolls down his forehead. It wasn't long before he felt his balls boiling for a shot. "I..."

"Let it go," She hugs him tight she whispers to his ears.

"But..."

"It's okay, little brother. I love you."

That last one was like a lightning rod to his brain. No longer was he have any reserves. "Big sis... Big sis... Big sis... Big sis..." It was pure mating instinct. Hiro thrusts his hips a few more times before finally he came in her deepest part. His body stiffened. His legs locked in muscle spasms with each spurt he shot into Honey Lemon's ravenous womb. He would have fallen on his knees, if Honey Lemon hadn't had a hold of him.

"Good... Good little brother..." She lets out a satisfying sigh. "Now that... is a chemical reaction..."

"Yeah..."

"Hiro?"

"Huh?"

"You okay? You're spacing out." Noted Honey Lemon.

Not again, he thought. "Um, sorry about that." He touches his forehead. The pulsing pain told him at least that was true and not a fantasy.

"Oh I don't mind. Besides you look like you're daydreaming about something nice."

Uh oh.

"Is it something naughty?" She looks at him mischieviously.

Hiro's eyes dart left and right.

"Aha. I'm right am I? Well since I'm the only pretty girl around then I'm posi-"

"Kaythanksbye I'llseeyoulater!"

"Hiro!?" But Hiro didn't look back and ran straight out the library.