Before the touching scene of the reunited siblings could even unfold, a certain food-lover cried out, causing Tohsaka Rin to bolt away as if instantly relieved.

Lin Luo couldn't help but feel speechless. Hadn't she just been eating? Was she a bottomless pit? Of course, he was inwardly quite pleased with Index's behavior; it was best if she clung to Rin every moment, ensuring that Rin never had a chance to be alone with the 'Date Fighter,' otherwise, Lin Luo would be under immense pressure... Hmm, perhaps he needed to add another lock onto Index later.

"Um, you are..." Kamijou Touma looked at Lin Luo, scratching the back of his head apologetically, "I still don't know your name. You're with my sister, are you family too?"

"Well about that..." Lin Luo suddenly remembered he hadn't introduced himself despite talking so much. He turned to glance towards the kitchen, confirming Rin couldn't overhear their conversation, then whispered, "My name is Lin Luo, and I am Rin's fiancé."

"Hah??!!" Kamijou Touma looked as if he’d been staring into Medusa's eyes, momentarily frozen solid. After a good while, he recovered, pointing at Lin Luo with an expression of shock and suspicion, "You... you must be joking, right?"

He could never accept that this boy, who looked at most thirteen or fourteen, could be the fiancé of his older sister, Kamijou Rin?

"Sigh." Lin Luo let out a breath, a hint of wistfulness clouding his face. "Actually, despite how I look, I'm already eighteen. It's just that I had a minor accident recently, which is why I'm in this body."

"...An accident?" The hedgehog-haired youth found it hard to believe, but then he recalled that there was someone near him who, despite being over thirty, maintained a loli's body. Compared to that, an eighteen-year-old pseudo-shota wasn't entirely unacceptable.

"In that case... should I call you Brother-in-law?"

"No, no, please don't do that," Lin Luo waved his hands frantically. If the 'Big Sister' called him that and Rin overheard, he'd be skinned alive. "Just call me by my name, and please don't mention this to Rin either."

"Why?"

"Well, Rin is rather tsundere and shy. Even though we're family, she'd feel awkward if others knew about our relationship."

"Is... that so?" Kamijou Touma muttered. Though he had amnesia, he wasn't an idiot; his ability to think was intact. He felt a huge sense of incongruity regarding this inexplicably surfacing older sister and brother-in-law.

Lin Luo knew perfectly well that such a lie was like a wall made of mud—it wouldn't withstand scrutiny, crumbling with the slightest touch. But that required someone to actually prod it, and given the 'Big Sister's' current condition, there was no room for questioning, unless he could confirm it with his parents... and as long as he could sign a contract with Rin in the meantime, he could take her and Mikoto away from this world at any moment.

"Ugh!" Thinking of Kamijou's parents, Lin Luo suddenly remembered something. According to the original storyline, that incident was due to happen in about four or five days... it was something terrifying just to contemplate.

Damn it, he almost forgot! That absolutely couldn't be allowed to happen!

After a brief chat, he quickly sent Touma over to Index and instantly dove into the Misaka Network.

"Meirei, can you hear me?"

"Huh? Lin Luo, what's up?"

"Yes, I need your help with something... do you have a way to temporarily leave Academy City?"

"With my abilities, leaving Academy City is no problem. Did you run into trouble?"

"You could say that. I need you to go to a specific location and destroy something. The place is..."

After briefing Zero on her task, Lin Luo withdrew from the Misaka Network and glanced toward the living room. He saw that the 'Big Sister' was nowhere to be seen; only the gluttonous nun remained by the table. Lin Luo jumped in alarm and hurried to the kitchen—thankfully, Rin was the only one there too.

"Um, where is the Kamijou boy?" Returning to the living room, Lin Luo asked the silver-haired nun sitting there.

"Don't know, he seemed to have gone out to buy things..." Index lay limply on the table, her chin resting on the surface, her eyes dull. "Hnnngh... I'm so hungry."

Lin Luo nearly spat blood. What the hell, are you the reincarnation of a hungry ghost? Didn't you just finish eating?!

"Oh, weren't you guys delivering takeout? How did you become Touma's family?" Index lifted her head to ask.

You are too slow to realize, you should have asked this question ages ago, Lin Luo thought wryly. "Because I specialize in handing out bento boxes, that makes me a takeout delivery person. That doesn't conflict with your second question."

Then, Lin Luo walked over and sat beside her, cutting straight to the chase. "Right, Miss Index, do you have feelings for the Kamijou boy?"

"Ah..." The silver-haired nun froze for a moment, then looked like a kitten whose tail had been grabbed, her face a picture of panic and confusion. "No... that... actually... I am..."

Speechless? She wasn't even a tsundere type.

Lin Luo grumbled internally, but outwardly he said, "Well, your reaction has told me the answer. So, I'm prepared to give you a very important piece of intelligence."

"Eh?"

"The truth is, Kamijou boy is an Ane-con."

"Ah? That... what is an Ane-con?"

"An Ane-con refers to boys whose psychology is a little twisted because they like older sister types..." Lin Luo explained, "...Kamijou boy used to really like older sister types. So, to prevent his perversion from expanding infinitely, you must keep a very close watch on him these next few days. You absolutely cannot let him be alone with Rin. This is an issue concerning human morality, and only a great and proper nun like yourself can complete this mission. So, do you understand?"

Index was silent for a long time, Lin Luo unsure what she was contemplating. After about five minutes, she finally slapped her flat chest. "I understand! Leave this mission to me with confidence, on my honor as a nun!"

You have nun honor too?

Lin Luo really wanted to make that comment, but to avoid dampening her enthusiasm, he gently patted her shoulder and said seriously, "Yes, I have high hopes for you."

Index looked at Lin Luo, and after a few seconds, she placed her hand on his shoulder too. "You are such a good person!"

Great, got friend-zoned!

...

For a long time afterward, Lin Luo busied himself with preparations to prevent the 'Date Fighter' from NTR-ing him, while remaining constantly vigilant to avoid any unexpected incidents.

For example: "What! Rin, you say you need to take a bath?" "Yes, apart from washing once in the hospital, I haven't really washed these past few days; I'm covered in sweat. Now that I finally have the chance, I can't miss it." "Mmm... alright then. I'll stand guard at the door for you." "Huh? Why?" "Don't worry about that for now. Just know that bathing in this house is extremely dangerous, and I can't risk putting you in such peril."

Thus, after Rin entered the bathroom, Lin Luo immediately brought over a chair and sat in front of the bathroom door, guarding against the elusive 'Date Fighter.'

Or take bedtime. Since this dog kennel was barely large enough for four people, the sleeping arrangement was Rin and Index sharing the bedroom, while Lin Luo and the 'Date Fighter' slept in the living room.

As Rin went into the bedroom to rest, Lin Luo issued a very stern warning: "Rin, make sure you lock the door when you sleep, and it's best to sleep with clothes on!"

Afterward, he dragged a sofa over to barricade the bedroom door and lay down on it himself. ...In short, Lin Luo made tireless efforts to protect the safety of his harem!

As he was drifting off to sleep, Lin Luo vaguely overheard the following conversation: "Rin, what are we eating tomorrow?" "Index, I heard you know a lot of magic, can you teach me some?" "...The 103,000 grimoires cannot be shown to ordinary people." "...But as a magician, I won't survive if I don't learn magic. If I die, you won't get any good food..." "Hmph, are you threatening me?" "I'm just stating facts. How about this: one luxurious Chinese banquet in exchange for one spell?" "No! How can a nun do such a thing!" "Two dishes?" "This isn't about quantity, it's about a nun's professional ethics." "Three dishes?" "Hmph, it's impossible, I said no..." "Ten dishes?" "Rin, I told you it's impossible, even for a common spell... How about ten dishes?" "Fine, deal!" ...

All sorts of things were proceeding in an orderly fashion... supposedly. ...Soon, seven days had passed since Lin Luo and Rin moved into the 'Big Sister's' home. Due to the existence of Imagine Breaker and the Grimoire, the Hanged Man seemed to have truly withdrawn the order to attack Rin, and the Dark Side had not appeared.

These seven days were incredibly busy for Lin Luo. On one hand, he had to conquer Rin; on the other, he had to prevent any accidents involving the 'Date Fighter.' When he had spare time, he would go and repair the clones' bodies, and to avoid losing the big picture for the small details, he had to maintain his relationship with Railgun from time to time. Moreover, he needed to keep misleading Shirai Kuroko... In short, before the true harem was even established, he was already exhausted, wishing he could split into seven!

Of course, there were good developments too. On the third day, Meirei sent word: she had destroyed a building and everything inside it with a single Railgun blast... This allowed Lin Luo to breathe a sigh of relief. With his intervention, the Angel Fall incident was prevented ahead of time, avoiding many potential mishaps.

Furthermore, over these seven days, the bodies of all the sisters in Academy City had been completely repaired by Lin Luo. Conservatively estimated, the weakest among them was at the peak of Level 3, with a few even reaching Level 4.

In the process of conquering Touhsaka Rin, her favorability had already reached 75%, unlocking the first seal of the World Heart. Lin Luo gained access to Rin's Contracted Form, although, given Rin's current power level, this form was temporarily useless to Lin Luo.

Everything seemed to be progressing positively, but then, on the evening of the seventh day, an unexpected accident occurred that Lin Luo had not foreseen—Kamijou Touma was injured and hospitalized!

This accident completely disrupted Lin Luo's plans. The reason he moved in with the 'Date Fighter' wasn't just to involve him in the conflict with the Hanged Man, but purely as a deterrent force.

In the Hanged Man's plan, the 'Date Fighter' held unparalleled importance, far surpassing the significance of Rin, perhaps even rivaling that of his Artificial Angel. Therefore, for this very reason, Lin Luo was absolutely certain that as long as he was in contact with the 'Date Fighter,' the Hanged Man would have many reservations and wouldn't dare to act rashly, especially with the presence of the Index Librorum Prohibitorum!

But now that the 'Date Fighter' was injured and hospitalized, he clearly couldn't serve as a deterrent. This left Lin Luo and Rin in a very awkward position.

And after that, he received another, even more shocking piece of news.

"What did you say? Last Order is missing?!" When Lin Luo heard the words from Yoshikawa on the phone, his expression changed instantly.

P: Alright, to avoid writer's block, I'll resolve the transitional issues in one chapter. Next up is the ** part. Vote please.