"Sis-con&Bro-con"

As we were having dinner at the dining table, I was seated with Mikan by my side, and Rito and Lala were across from us. As we were eating, Lala was talking to Mikan, praising the food.

"This soup tastes so good!" Lala exclaimed.

"It's miso soup with clams," Mikan replied.

"I see! Earthling food is delicious, isn't it, Mikan!?" Lala said.

"Tsk, tsk. It's not just that, Lala-san. It's the cook's skill," Mikan retorted.

Joining in the fun, I said, "Well, whatever you cook, Mi-chan, it will always turn out delicious."

As we talked casually at the table, Rito seemed in deep thought until Mikan interrupted his thoughts and called out to him, "Hey, Rito."

"So when are you getting married to Lala-san?" she said.

"Mi-Mikan! I mean, why are you treating Lala as part of the family already? She's an alien!!" Rito said in a panic.

"Come on now, Rito. She is already part of the family. She-is-already your wife-to-be," I retorted Rito's statement.

"Right, right. And who cares if she's an alien? She looks like a human and speaks our language. There are only the three of us here anyway, so it's not a problem for one more. And after Lala-san showed up, this house has become more bright and cheerful. I'm happy," Mikan said with a smile.

As Mikan said that, Lala called out to Rito. So, I called out to Mikan to start cleaning the dishes. As we were cleaning the table, we heard their conversation.

"We've had dinner, so let's take a bath together!" Lala energetically suggested to Rito.

"Huh?!" Rito exclaimed.

Rito started to blush intensely. "We can't!!" he said and stayed in the corner.

"Lala-san, that's impossible. There's no way Rito would have that much courage," Mikan said.

Lala pouted for a second, then said, "Then, Mikan! Let's take a bath together," as she asked Mikan.

"Sorry, Lala-san. Maybe next time. I still have to help Yuu-nii with the dishes," Mikan said, refusing Lala's invitation as she came near me to help with the dishes.

"Why did you refuse, Lala-san, Mi-chan? I can manage alone, you know," I asked Mikan.

Mikan didn't actually answer me and just said, "I said I'm helping with the dishes."

Shrugging it off, I focused on the cleaning.

After finishing cleaning, "I'll be heading to the bath now, Mi-chan," I said to Mikan.

"Ah. Would you want me to get your clothes, Yuu-nii?" Mikan replied.

"That'd be great, Mi-chan. Thanks," I said as I headed to the bath.

You know what our bathroom looks like, right? It has two areas, separated by a not-visible glass door. one for the shower, the tub, and stuff. The other is the sink, laundry, and stuff. I just finished taking off all my clothes and headed to the shower area. As I soaked in the shower, I heard someone in the laundry area. 'Must be Mi-chan' I thought. after a short soaking. I sat in the small chair to clean myself, and that's when the glass door separating the laundry area and shower area opened.

I stare shocked at my revealing little sister standing there with nothing but a towel around her innocent body.

"Let's take a bath together, Nii," she said, snapping me out of a daze. 

"Okay?" I replied.

"Let me wash your back," she said as she went and washed my back.

As she was washing my back, I decided not to think too much about it. We did take baths together a few years ago.

"Your back is hard and muscular, Nii," she said.

"Well, I am working out lately, right?" I replied.

Shortly after, "And done!" Mikan declared as she took off her towel, revealing her naked body, her cute, modest breasts, and her petite body. At that moment, I stood up and faced her, because I didn't know she would take off her towel as I turned around. A moment of silence washes us over as I look at her naked body, especially her cute, modest breast, and she's in a slight bow and seems to be looking at my junk. 

After a few seconds of admiration, I decided to break the silence. I patted her head and said, "Let's wash you next," guiding her to sit. 

"Y-yes," she replied with a slight blush on her cheek.

I hesitated for a moment before starting to touch her back—I mean, wash her back.

As I touc-washed her back, Mikan said, "You gone, got big, Nii."

"Like you're one to talk, little sis," I retorted.

"Hmm?" she murmured, tilting her head as she moved her hands to her chests.

Seeing her feel her cute breast, I lean toward her and whisper to her ears, "Can I wash the front too, Mi-chan?" I ask.

not shaken by my whisper, "Wanna feel them, Nii?" she replied, still touching her breast.

I was taken aback by what she said. I said, "I was just kidding," as I laughed warily and added, "I'll head to the tub first." 

As I soaked in the tub, I said, "So, what's bothering you, Mi-chan?".

"How'd you know Nii?" she said, looking at me with a slightly shocked expression.

"Don't underestimate my big brother's senses, little sis; we've been together like forever; of course, I'll know my little sister better than anyone," I said with a smug face, then added, "Oh, and Rito too!"

"Yeah, you've always watched over us since day one, Nii, but," she said.

"But?" I replied, urging her to continue.

"I don't know if I can take what you said seriously as you ogle at my naked body, Nii." she said as she looked at me skeptically.

I laughed once again warily as I said, "I can't help it. sorry," sounding unconvincing. 

And yes. I was looking at her perfect, cute little naked body this whole time! Please don't call the NBI. And one more thing: DON'T EVEN THINK ABOUT IMAGINING MY LITTLE SISTER NAKED! Thank you.

Mikan sighed and stood up, then headed straight to the tub, soaking as she sat on my lap.

"Is it about the engagement?" I asked.

"Un," she replied.

"You don't like Lala-san?" I asked.

"No, no. It's not like that, Nii. Lala-san is fun to be around and sweet, but..." she said, trailing off her last words.

I patted her head, and she turned her head to look at me with a cute expression. I said, "You're worried she's going to take your big bro somewhere far, right?"

"Yes, it's always just been the three of us, Nii. I want it to stay that way for a long time," Mikan said, with a hint of loneliness.

"Ugh! My little sister is being so cute!" I said, as I clenched my chest with an exaggerated act.

"Yuu-Nii, I'm being serious!" Mikan said, pouting.

Clearing my throat, I said, "You're always putting up a tough front and acting all mature, especially in front of Rito, but inside, you really care for him, which is really cute, Mi-chan."

"Of course, even if Rito is hopeless, he's always been there for me, Nii," she explained.

"I know," I said.

"Of course, Nii. Every time something happens to me and Rito comes to the rescue, you're always hiding in the corner watching us. That's why I know you're always watching over us. Thanks, Nii," Mikan replied and thanked me.

"Ehh?! I thought I hid flawlessly," I said, shocked.

Clearing my throat again, I said, "Anyway, you don't have to worry. Even if Rito goes off on his own, you'll always have me."

"Really?" she asked.

"Really," I reassured her.

"Even if you have a girlfriend?" she asked.

"Yes," I replied.

"We can still take a bath together," she asked.

"Yeah," being taken aback and almost saying yes, I restate, "Maybe for a while, yes, but if you've grown up enough, it'll be unhealthy."

"I know, I'm just kidding," she said as she chuckled, then added, "But I can always sleep with you, right?"

"That'd be fine, yes," I replied.

"I'll take you up on that then," she replied happily.

Then there was a moment of silence before Mikan said, "I love you, Nii."

As she said that, I smiled warmly, then hugged her from behind as I placed my head on her shoulder. "I love you too, Mi-chan," I whispered.

After a few seconds, Mikan asked, "I thought you didn't want to feel them, Nii?"

"It's too tempting, Mi-chan," I said while my eyes closed, still not moving from her shoulder.

Then I heard her say, "It's fine, Nii," with a quiet voice, and I was lost in thought.

Feeling her modest breast that is just the right size for my hands, feeling her natural warmth, and feeling her nipple in the middle of my palms, I feel like I'm on cloud nine.

Snapping me out of my lewd thoughts, Mikan said, "Sorry to interrupt my naughty Big Brother, but we should really get out of the bath now."

Opening my eyes, I replied, "Ah, yes." Then we finished our heartwarming bath.

Third Person (POV)

"While Yuu and Mikan are taking a bath, Rito and Lala are in the living room watching TV.

"Hey Rito, where's Mikan?" Lala asked.

"She went to take a bath with Yuu-nii," Rito answered.

"Ehh?! Why can they go together and we can't, Rito!" Lala said, pouting.

"Just because!" Rito retorted, blushing.

'Mikan has always been so close to Yuu-nii since we were little, so it's no surprise for them to bathe together,' Rito thought, shrugging it off.

****

After walking out of the bath, I headed straight to bed because I still have my routine early in the morning. And as for Mikan? She went to the living room after we bid good nights to each other to hang out with Lala.

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Narrator here!

Let me clarify something.

"I'll only be Updating Chapters when I'm Free, Thanks!"

The relationship between Yuu and Mikan is just a Sis-con and Bro-con relationship, so don't expect incest in the story. Thanks.