Monkey D. Luffy, a boy who ate Gomu Gomu no mi and became a rubber man, was heavily influenced by a red-haired pirate, commonly known as Shanks. The boy had tried to ask - pestered more appropriately - the red-haired captain to take him on the next voyage. The boy wanted to be a pirate, much like the crew he had grown so close to. But they always rejected his appeal, citing he was too young and childish to take on the next voyage. He had even gone so far as to stab himself right below his eye to show his 'manliness'. That had earned him a lecture from the same red-haired captain, that still made his ear bleed. He shuddered to think what happened after that 'party' Shanks had thrown him for his stupidity. He still hated the fact that his idol lost his arm because of his stupidity. So when Shanks asked he was not going to pester them to take him with him, he had burst out telling the tomato-haired drunk that he will gather a crew better than his and become a great pirate. Shanks had smiled at the young boy and had left the said boy with his treasured hat.

Fast forward to a few weeks later, his 'ji-chan' Garp the Fist, had come home to listen to his grandson going on and on about how he will become not any pirate but a 'pirate king'. Furious at it, he had dropped the rubber child at the bandits that took care of Ace for him. Luffy soon gained two elder brothers, who were always around looking after him. Tragedy had soon stuck the ASL brothers when Sabo's ship was attacked by a Celestial Dragon. No one was found, but he was essentially declared 'dead', leaving the two brothers to mourn their beloved brother.

At present, Makino was providing the boys with the education she knew that Dadan won't bother with. The two boys were sitting in front of her after her usual 'manner' session with Ace. The freckled boy wanting to learn manners to thank the person who saved his brother's life.

"Alright, let's begin" Makino smiled at the boys while Luffy wondered why he has to learn it too, "Now, now, Luffy. These aren't your lessons for manners. This is something everyone must know. I will start with basics first, okay?" The two boys nodded at her, "Alright. We all know that there are males and females, right? Like you both are males and I am a female. But, apart from our primary sex, we all have secondary sex too. A sub-sex." Makino started while the boys looked at her in confusion. "Now, listen carefully, you both. At the age of 12, each individual goes through changes in their body. Their sub-sex is activated at their twelfth birthday. Once one's sub sex awakens, the body evolves to no longer produce physical waste. The body will break down all food and convert it into energy and the manhole becomes only for mating. Commonly known, there are three common sub sexes and two rare sub sexes. As Ace-kun here in older, he will be presenting first. Now, the first common sub-sex known is the Alpha. they are the leaders of the pack. Their personalities vary but the best are those who are kind and caring for their pack members. Get it, you both? If you ever present as an Alpha, I do not want to see you being rough with your mates" She gave them a meaningful glare while the two boys gulped, "Moving on, Alpha's pheromones can control and intimidate the other sub sexes. As the head of the pack, they are born with greater strength and stamina. Alpha cocks are always larger, and when mating the base of the penis will swell forming a knot to lock their partner together."

The two boys wondered if they will be an Alpha. Both of them had great stamina.

"The other common sub sex is Beta. They are often the mediators of the pack. Their pheromones have a soothing effect on both Alphas and Omegas. They do have decent strength and stamina but can go into heat. A beta going into heat is not common but it is possible. When in heat, they produce slick for easy penetration by an alpha. They can get pregnant, but only if they are in heat. No omega can impregnate a beta."

Ace turned towards Luffy and laughed while ruffling his hairs, "That sounds perfect for you Luffy" While Luffy pouted at that.

"Last of the three common sub sex is Omega. They are often seen as the caretakers of the pack. They produce slick when aroused and can go a little crazy when in heat. They can get pregnant in and out of the heat, so using protection is a must. They have smaller cocks and their manholes are more sensitive and easily stretched. They can have a high sex drive and often needs a strong alpha to satisfy them. Maybe more too."

Makino sighed as she finally moved on to the two missing links, "Onto the rare sub sexes now. First of them is a Delta. It's a missing link between Beta and Omega. Thos with this sub sex has two genitalia, a cock, and a pussy. They can get pregnant from Alphas, Betas, and Omegas in and out of heat cycles and become wet when aroused. Though they can't get Betas pregnant but can impregnate an Omega. Their size is on par with a Beta but they don't have a knot. Their pussy can be quite sensitive so mating alphas can be very intense.

"Lastly, there are the Gammas. They are the missing link between alpha and omega. Those born to this sub sex have alpha instincts but produce slick when aroused and go into heat. They use this to determine the perfect mate for them. When a Gamma is dominated by an alpha, it awakens their alpha sex drive, allowing them to mate betas and omegas. They will only let one alpha dominate them. That link between an alpha and a gamma is for life."

The two boys nodded as they took in the whole information.

When Ace awakened to his sub sex on his 12th birthday, he was shocked to find that he was a Gamma and not the Alpha he was expecting himself to be. That put him out for quite some time during which Luffy teased him mercilessly.

As years passed and Luffy awakened his sub sex, much to the shock of Ace, it was an Alpha. He pouted for days regarding that citing how he was stronger than his weak little brother. Though inwardly, he was pleased that his brother was an Alpha and knew he will make a damn good Alpha too. One Makino wanted them to be like.

The two had grown closer over the years. While Luffy being an Alpha did not arouse him in any sense, Ace's omega instincts would act out and he would slip in his brother's bed, longing for an Alpha to take care of him. Luffy would just smile warmly at his brother and wrap his rubbery arm around the defined torso of his elder brother and pull him close to his chest, letting his scent soothe his elder brother. Every night, Luffy would drop a sweet kiss on his sleeping brother's forehead and watch the elder boy snuggle closer to his lithe body, seeking comfort which Luffy happily provided.

As Ace's 17th birthday drew closer, he would fall more and more into his submissive persona. Luffy watched his brother sit on the cliff, watching the wide ocean in front of him. Making his way quietly behind his elder brother, he sat down, his hands wrapping around Ace's waist, pulling him back to his chest and rested his chin on his shoulder.

"I will miss you" Ace whispered quietly.

Luffy tightened his hold around his brother's waist as he replied, "Me too. I will be all alone here. But I know Ace will do well. Ace will find his perfect Alpha who will look after Ace," Luffy pecked the blushing boy's cheek and smiled wide, "I love you,"

"Don't go all sappy on me now!" Ace huffed but smiled inwardly, leaning back on his brother's chest, "You look nothing like an Alpha, you know?"

"It's perhaps my devil fruit," Luffy grumbled.

"Huh. Maybe it is," Ace turned his head as he grinned at his brother, "I leave tomorrow. Try not to be eaten by alligators any more, okay, Lu?" Ace teased.

Luffy rolled his eyes and replied back, "I'm stronger than before." and he grinned back at Ace, "Try not to catch unwanted attention of any Alpha that's not deserving of you"

Ace huffed.

Ace left the next day. Luffy, the mountain bandits, Makino, and Mayor stood on the shore as they waved at the freckled boy wishing him a great journey. Luffy smiled wide at his elder brother, his hands waving animatedly, wishing his brother good luck.

It was a week later that Garp decided to drop by the bandit's hut. As one of his random fits, he decided he won't let Luffy follow Ace's path and took the boy with him on his marine ship, intending to train the boy to be a goody-two-shoes marine under his watchful eyes.