This was published in 'What If' as an alternate ending to a chapter of 'Earth Loudest Heroes', but I tought it was worth to continuing as a story of its own.

This chapter is the aftermath of a fight between Lincoln and a villain inside the family home, but leading to a path that Lincoln could never have imagined.

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After all the trouble they had with the Beetle, Bobby and the girls finally went into the living room. As soon as they arrived, they saw that most of the mess was tidied up in the corner, and they smelled food in the kitchen.

"Hey, I'm glad you arrived!" Lincoln said, stepping out of the kitchen. "I saw you were taking too long, and I cleaned what I could. I'm about to finish dinner, I made spaghetti with meatballs."

After the day they had, a nice portion of food made by Lincoln was pretty much the only option to end the day well. Each of the girls went to her room to take a shower and prepare for dinner, while Bobby took an extra uniform in his suitcase and went to the bathroom of one of the guest rooms.

But one of the sisters decided to go to the kitchen.

"Lincoln, you, like, have a minute?" Leni asked, looking at her brother with concern.

He was about to take the large platter of spaghetti into the dining room, but left it where it was. He did not know what to expect from his sister.

"Sure, Leni. What's it?"

She was silent, and walked over to him. She looked him in the eye, then put a finger in his chest.

"Is it still hurting?"

"W-what do you mean Leni?" He was nervous. A thought passed in his head, but he ignored it. It was not possible. "What are you talking about?"

"The shot you took earlier, you silly. When you was wearing your Marvel Boy outfit."

Lincoln stiffened like a wall, his eyes wide. How did Leni, his foolish sister Leni, discovered his secret?

"Leni, please let me explain..."

She put a finger in her brother's lips, silencing him.

"Do not worry, Linky. I will not tell anyone." She then looked at him maliciously. "With a condition."

"W-what condition?"

"You will do something for me, and if I am satisfied, I will keep your secret. Meet me at my room at midnight, and don't forget to wear your costume."

The girl left the kitchen quietly, leaving a stunned boy behind.

"I have a bad feeling about this."

LATER THAT NIGHT

After the exhausting day they had, all family members ended up going to bed early. Or so it seemed.

As soon as it was midnight, Lincoln opened the door to his room, staring intently down the hall to make sure none of his sisters were watching. He was wearing his pajamas, but he was wearing his symbi-watch, to turn into Marvel Boy inside Leni's room, avoiding being seen by the hallway camera.

He sneaked past Luan's door, and then put his hand on the knob of Leni's room.

The boy paused a moment to think of his options. As much as he wants to keep his secret, he is afraid of what Leni might want to do with him.

He smiled, realizing that he was exaggerating. If it had been Lori or Lola who had discovered his secret, he would certainly have something to worry about, but it was Leni who wanted something in return for keeping his secret.

What could possibly go wrong with his silly sister?

As soon as he opened the door, Lincoln came upon something he had never expected to see.

Leni was sitting on the edge of her bed, wearing a white robe. Her legs were crossed in a way that he could see some red panties, indicating that she was not wearing her usual nightgown. But the most disturbing was his gaze. She had a wicked grin as she stared at him as if she were starving.

He was petrified with the scene before him, until Leni pulled him out of the trance.

"Oh, it's just you, Lincoln. I was expecting someone else." She pretended disappointment.

"Oh, of course." He answered, closing the door. He then put his hand on his symbi-watch and pressed the button. "Assemble!"

Leni was delighted to see Lincoln's pajamas turn into his Marvel Boy costume, while the watch seemed to melt.

"That's what I wanted!" She was euphoric and ran to her brother, hugging him. "I've always dreamed of it, and now I finally have my chance."

Lincoln was confused, but decided to go with what Leni wanted.

"Well, what exactly do you want? I'm willing to do any of your chores if I have to."

Leni just laughed, and led her brother to the bed, and made him sit next to her.

"I do not think I made that clear. I do not want you to do something 'for me', I want you to do something 'with me'."

"And what would it be?"

"I'll tell you a little secret about me." She took the boy's hand, and assumed a kind tone. "Ever since I was a child, I've always heard the story of how our parents met, and I decided that one day I would also find a handsome hero to be my boyfriend and have a beautiful romance."

Upon hearing this, the boy realized where he was putting himself into.

"When you saved us from that villain, I was very relieved. But when I healed you, and I realized who you really was. Who would have thought my little brother was a superhero?"

"So, that's how you found out?" He was astonished to learn how she unmasked him. "But what exactly do you want?"

Moving with a speed that could be compared to Lynn's, Leni kissed his lips.

Marvel Boy was completely paralyzed, not knowing how to react. He felt Leni's soft lips against his, giving him an unprecedented experience.

"That's not how I expected it to be my first kiss." He thought as he processed what was happening.

Leni broke the kiss, and looked into the boy's eyes.

"Since I haven't met any handsome hero, I think my little brother will must be enough for now."

Before Leni could try anything, Lincoln took the girl's wrists and skillfully turned her, sitting on her back and keeping her arms immobilized, a movement that Ronnie Anne had taught him.

"Leni, are you crazy? We're siblings, we cannot do this kind of thing!"

"I didn't know you were so strong, Linky." Feeling the tight grip of her brother only made Leni even more excited. "I bet you're even stronger than Bobby."

"Leni, please pay attention!" Lincoln tried to sound steady, but the concern in his voice was clear. "I even understand that you have a fantasy involving doin... this stuff with a superhero, but stop a little and think. Do you really think that's right?"

A few hours ago, she even thought that was wrong, but now the lust blinded reason. Instead of being remorseful, she felt indignant to receive a moral lesson from her little brother.

She then remembered who was really in control.

"Oooh, I think you're right, Linky. I mean, it's not like you really have to do what I say, since I have nothing to make you obey me." She turned her face slightly, with a smug smile.

Lincoln immediately let go of Leni's arms, shocked to be blackmailed by his sister.

He'd expect this sort of thing from Lola, or Lori, or Lynn, or even Lisa. But Leni? Never.

The boy froze, trying to think of a way out. Even though he wanted to keep his identity secret, he knew it was wrong. Still, Leni was the nicest person he knew, and even if it was such a bizarre thing, he knew he would hurt his sister if he did not agree with her.

"(Sigh) Okay, I'll do whatever you want." He looked at her earnestly. "But you have to swear it will only be this time, and we will never talk about it."

The girl was excited, and threw herself into the arms of her brother.

"Oh Linky! You have my word!" She let him go, and looked at him lasciviously. "Unless you ask for more, of course."

The boy rolled his eyes, then stepped off her, helping her up.

"And now what do we do?" He asked, still uncomfortable with what he was about to do.

"Leave it with me!" Leni replied, removing her robe.

Lincoln was amazed to see Leni's tight underwear. Immediately, a tent began to form in Lincoln's pants, making Leni smile even more.

"Oooh, looks like somebody's pretty anxious..."

She made him sit on the bed, and then tried to lower the boy's pants. However, the material seemed to be quite adhesive, and it seemed to be glued to the shirt.

"What's the problem with this thing!?" Leni started to get frustrated.

"Sorry, I think it's me." Lincoln's face was as red as his suit, so embarrassed he was. "That reacts to my thoughts, and I think I'm still not totally convinced yet"

Leni put a finger on her chin, and did something that Lincoln was not used to seeing her do: think! Suddenly she smiled mischievously.

"I think I know what to do."

The girl then placed her hands behind her back, and slowly released her bra, leaving the boy in a trance. As soon as she saw Leni's beautiful pink nipples, the tent increased even more. By the looks, the super-costume would not hold out much longer, and Leni realized that.

Slowly and seductively, she placed her hands on her breasts and then began to slide them slowly down to her hips, then held her panties.

"And now, the main event!"

With a quick, precise movement, she lowered her last piece of clothing, revealing her wet pussy.

Immediately, Lincoln's intelligent suit realized that it was no use holding his manhood, and released his erection. The suit then retreated, leaving Lincoln with only his Marvel Boy's mask, gloves, and boots.

Leni looked at her prize, licking her lips. She had never seen one so close, but it was impressive, though having no more than four inches. She knelt on the floor, and began to play with her brother's cock, making the boy moan. She wrapped the meat stick in one hand while stroking her pussy with the other.

The feel of Leni's hand wrapping his manhood was almost unbearable to the boy, but after a while she grew tired of using her hands.

Leni lifted her tongue to the base of Lincoln's cock, licking slowly, until she stopped on his head.

The boy looked at her in deep bliss, anticipating what she would do. After smirking, she swallowed the cock, massaging it with her tongue. Leni began to put the cock deeper and deeper until she swallowed it completely. Lincoln could hardly believe how much he liked the blonde bobbing her head up and down, releasing even more pleasure to the boy.

Lincoln began to feel something growing inside him, as if something was trying to leave.

"L-Leni, I-"

"Not so fast, big boy." The girl removed the limb from her mouth, smirking. "I do not want the fun to end so soon."

Lincoln began to feel frustrated.

After finally giving in to Leni's seduction, she was now teasing him.

She got up, and then climbed onto the bed, laying so that the boy would face her open legs. Using both hands, she opened her lower lips, giving the boy a perfect view of her wet pussy.

"Do not just stand there and watch. It's time to return the favor."

He looked at her curiously, still processing what she said. Slowly he crawled through the sheets, until he was face to face with his sister's wonderful genitalia. He grabbed her legs for stability, then lowered his head.

He first approached his nose, inhaling Leni's scent. Then he took a long and slow lick, making the girl moan with pleasure. He was not familiar with the taste of Leni's juices, but his tongue seemed to yearn for more. He opened his mouth as wide as he could, and then stepped into the hot pussy.

As Lincoln's tongue danced inside Leni, the girl felt more and more aroused, her moans louder and louder. She was finally having what her body had been wanting for a long time, but still it was not enough.

"L-Lincoln... enough o-of foreplay... I w-want to feel you inside me."

Like an obedient pet, the boy stopped licking her pussy, slowly climbing over his sister's body. He stood in front of the girl, staring into her eyes, his tongue hanging like a cute thirsty puppy.

The boy was acting out of pure instinct, getting carried away by the excitement. His cock was at full mast again, his head poking the pussy's entrance. The tension was so great that none of them dared to say a word, feeling each other's breath on their faces, the only sound they heard being the beating of their hearts.

Then, in a sudden movement, Lincoln dived into the pussy.

Leni almost screamed as she felt her pussy being ravished so suddenly, her barrier fully pierced in a single thrust. Before she could say anything, she was silenced by Lincoln's lips, kissing her passionately. Their hips moved as if they had a will of their own, totally taken in by lust.

It did not take long, and Leni's tongue began to force her entrance into Lincoln's lips, which he readily accepted, their tongues struggling voraciously for dominance.

Their hands moved frantically across each other's bodies, feeling each part. Leni stopped her hands on the boy's buttocks and gently massaged them. Lincoln ran down the sides of the fashionista's body until he found her breasts. He began to play with her nipples, making the girl moan even more against his mouth.

As his cock penetrated his older sister's pussy, Lincoln felt as if the inside of Leni wanted to suck him, causing him to further increase the speed of his thrusts.

As their excitement increased, they both felt they were near climax. They began to move their hips even faster, until the sensation became unbearable. Lincoln completely removed his rod and then put it back with all his strength, making the legs of the bed break.

Leni was shocked to see that the bed had broken, but she was totally paralyzed when she felt Lincoln's cock tremble with extreme intensity. Soon, she felt like she'd been punched in her pussy, and then she felt something hot and sticky get into her body. Then, burst after burst of Lincoln's mighty cum entered her core, causing so much pleasure that she soon came too.

Both stood motionless, looking into each other's eyes.

After a few moments, the boy fell beside his sister, totally exhausted.

"Wow, that was certainly unexpected." Leni kissed her brother's cheek with too much effort, too sore to move. "Although I liked it a lot."

"I... I'm sorry." The boy tried to catch his breath, barely noticing his hero costume returning to normal. "I never imagined... that my super strength... also affected my cock."

"No need to apologize, silly." With the strength she still had, she laid her head on his chest, feeling like it was the best pillow in the world. "I even liked the feeling."

"Well, I think I owe you a new bed at least."

"We can leave this for later. Although I would love to lie down in a comfortable bed now."

"Well, if you do not mind walking a bit, I think we can go to my room."

Lincoln tried to look away, but his face was as red as his clothes. Leni just smiled to see how much her brother looked cute, despite having deflowered her a short time ago.

"Thank you, Linky. And do not worry, I'll keep my word, you never have to do this with me again."

"Actually..." The boy blushed, looking away. "... I would not mind doing it again. If you want, of course."

Leni smirked as she approached to kiss the boy's cheek.

"I would love to."

Both smiled happily as they embraced each other affectionately. After tonight, nothing would be as before, but none of them cared. The only thing in their minds was when they would do it again.

This is my first attempt at making a lemon, so I hope it's good.