"But first, you must promise something to me. You have to make a solemn vow right now."

"A promise?" Marine blinked her big, innocent blue eyes. She tilted her head to the side cute like a puppy. "What is it? What do I have to promise, Big Bro?"

Alex leaned in closer. He made his voice sound dark and mysterious, like he was sharing the secret of the universe.

"Marine, listen to me closely. In order to not disappoint Luke in any way... in order to make sure he doesn't run away from boredom... we need to make sure he instantly, and I mean instantly, falls in love with you all over again the moment you touch him. We need to blow his mind."

"Blow his mind?" Marine repeated, blushing.

"Exactly," Alex said. "And to do that, you need to be perfect. You can't be an amateur. You can't be clumsy. So, I need to teach you this thoroughly. I need to train you from the ground up."

He paused for dramatic effect.

"So, here is the promise. For that to happen, until all the lessons in sex are complete... until I say you are ready... you can't even give a kiss to him at all. You cannot hold his hand. You cannot hug him. And you definitely cannot kiss him. All contact with Luke is absolutely forbidden!"

"Forbidden?!" Marine gasped. "But... but..."

"No buts!" Alex interrupted her fast. He started spewing more bullshit lies.

"Think about it, Marine! If you kiss him now with your bad technique, he will know you are a rookie! He will be bored! But... if you wait? If you wait until all the lessons are done? You should be able to surprise him!

"You will surprise him to the point that he thinks you are a literal Sex Goddess! He will think you are a master of love! And once he feels your skills that I taught you... he will immediately propose! He will marry you right on the spot! He will worship the ground you walk on!"

'He he he,' Alex laughed evilly inside his head. 'What a load of crap. But she is buying it!'

[Genius, Boss! Absolute genius! You are basically cock-blocking the boyfriend while stealing the girl! This is the ultimate NTR strategy! By the time you are done "teaching" her, she won't even remember who Luke is!]

The System cheered loudly in his mind.

Marine sat there, processing this information. She imagined herself as a Sex Goddess. She imagined Luke kneeling down and asking her to marry him because she was so good at the sex thing.

"A... a Goddess?" she whispered. Her face turned bright red. "And he will marry me?"

"Guaranteed," Alex lied without blinking. "But only if you promise. No touching Luke until I certify you. Do you promise?"

Marine gulped. She looked at Alex. She trusted him. He was her Big Bro. He knew best.

"Okay..." she nodded slowly. "I promise! I won't touch him! I will save everything... for the training!"

Alex grinned. It was the grin of a wolf who just tricked the sheep into opening the gate.

"Great," he said. He shifted his position on the bed to look even more authoritative. "Now, before we start the physical part, there is one last condition. A very important condition."

"Another one?" Marine blinked.

"Yes. And this is the most critical one," Alex said, his voice dropping to a whisper. "Marine, if I am going to teach you... if I am going to turn you into a Sex Goddess... I need your full cooperation. I need 100% access."

"Access?" Marine tilted her head.

"Yes. That means... during these lessons, I may need to touch you. And I don't mean just holding hands. I mean I may need to touch your private parts. I may need to touch your boobs. I may need to touch your butt. And yes, I may even need to touch your... you know... your secret flower down there."

"Eeeeeh?!"

Marine let out a high-pitched squeak. Her face, which was already red, somehow turned an even darker shade of crimson! It was like a tomato exploding! She immediately crossed her arms over her chest and clamped her legs together tight.

"T-touch... my... down there?!" she stammered uncontrollably. She was flustered. She was panicking! "B-but... Step Bro! That is... that is too much! That is private! Only... only Luke should..."

"See? That is exactly the problem!" Alex interrupted her with a sigh. "You are too tense! How can you learn if you are scared of being touched? A doctor needs to touch the patient to heal them, right? A trainer needs to touch the athlete to fix their posture, right?"

"W-well... yes..." Marine whispered, uncertain.

"It is the same thing!" Alex declared confidently. "You are safe with me, Marine. I am your Big Bro. I am family. This is purely because of training and stuff. It is strictly educational. It is scientific! There is nothing dirty about it. It is just... anatomy practice. Nothing important."

"Scientific?" Marine repeated the word. It sounded smart. It sounded safe. "So... it's not... weird?"

"Not at all," Alex lied through his teeth. "It is necessary. So, do you agree? Can I touch you for the sake of your education?"

Marine bit her lower lip. She looked at him. She looked at the book. She thought about Luke proposing to her.

"O-okay..." she whispered softly. "If... if it's for training... then okay."

"Good girl," Alex grinned. "Now, for the final step of the setup."

He leaned in so close that their noses almost touched.

"Since you are learning how to be a perfect girlfriend... the best way to learn is by doing. So, from this moment on... right now... I will be your Unofficial Boyfriend."

"Un... unofficial?"

"Yes. And you," Alex poked her nose, "will be my Girlfriend. We are going to roleplay. And as my girlfriend, you have to do what every other girlfriend is doing."

He paused to let that sink in. His eyes traveled down to her lips.

"No exceptions. None at all. If a girlfriend kisses her boyfriend, you kiss me. If a girlfriend lets her boyfriend touch her, you let me touch you. You have to treat me exactly like you would treat Luke... but better. Because I am teaching you. Do you understand, my little girlfriend?"

Marine's heart pounded like a drum. Thump thump thump.

"No exceptions... at all?" she breathed out.

"At all," Alex smirked.

Marine's bashfulness was absolutely exploding. It was through the roof! Her face was so red that it looked like a ripe strawberry ready to burst. She was twisting her fingers together nervously.

"Okay," Alex said, acting very calm and professional. "Since this is the very first lesson, we will start small. We won't go to the heavy stuff yet. I just want a simple thing. Just a kiss on the cheek for the start."

"A... a kiss on the cheek?" Marine squeaked.

She froze. Her mind instantly started racing back to the past.

She thought about all the times she used to act wild. She thought about the times she basically bursts into his room when he was half-naked and all!

She used to jump on him! She used to hug him tight with him being annoyed and trying to push her away! Back then, she would even kiss his cheeks freely!

But... but it was all because she was totally innocent at that time! back then, a kiss was just a greeting! It was just a sisterly thing! She didn't know about the "birds and the bees"!

But right now? After reading that dirty book? After feeling the wetness? Even a simple kiss on the cheek felt like too much to her. It felt heavy. It felt like a sin! It felt like a gateway to the forbidden world of adults!

"I... I don't know..." she whispered, looking down at her toes. "It feels... different now. It feels scary."

Alex sighed. He shook his head with a look of pure disappointment. He looked like a teacher whose student just failed a simple math test.

"I assure you, Marine, it is just a cheek. It is skin. It is the same skin as your arm," Alex lied smoothly. "But if you are so hesitant... if you can't even do this simple, tiny, baby-level task..."

He stood up from the bed. Creak. He started to turn away.

"Fine. We can drop this right now. Forget the training. Forget the Sex Goddess plan."

"Wait!" Marine gasped.

"No, no," Alex waved his hand. "It is clear you are not ready. You can just remain a disappointment for Luke. It is okay. I am sure Luke won't mind having a boring girlfriend who doesn't know how to please him.

"I mean, sure, he might look at other girls who are better... but that is his choice, right? You can just stay here being shy while he finds a real woman."

Marine's heart shattered! A disappointment for Luke?! Luke looking at other women?!

"No!" she screamed. "Don't go! I can do it! I don't want to be a disappointment!"

Alex smirked!

'Bingo!'

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