"Ayase, the results of the DNA testing centers we went to earlier have been mailed."

One day in mid-October, in the living room of Chu Xuan's house, Chu Xuan placed a few large envelopes that had not yet been opened in front of Ayase, who came to take care of him after school.

"Huh?"

Ayase, who had just put her bag on the sofa in the living room, stiffened for a moment, and then returned to normal.

"Hmph...... The mail is coming......"

Ayase, who had planned to put on an apron and clean up briefly, sat down on the sofa and pretended not to care, picked up one of the large envelopes, and looked around as if wondering where to open it.

"Utility knife."

At this time, Chu Xuan very considerately put the tool for cutting the envelope into Ayase's hand, but instead he got a hidden white eye.

"By the way, big brother, your genes were left behind by them during testing, won't there be a problem?"

After Ayase grabbed the utility knife, she didn't rush to cut the envelope, but asked Chu Xuan with some concern.

Because of Chu Xuan's research, she has also made up a lot of knowledge about genes recently, and now she even knows that leaking her genetic information at will may cause economic losses and even personal harm.

Chu Xuan pushed down his reflective glasses and replied very calmly:

"No problem, DNA testing only uses a computer to compare key gene segments between the two of us to determine whether we are related, and does not pay attention to the genes themselves.

And even if they notice that my genes are special, it won't happen overnight to thoroughly study them, and they may not produce results in a few decades. ”

"That's right...... That's good......"

Ayase nodded lightly, and then carefully began to cut the envelope with a utility knife, and at the same time, at a volume that Chu Xuan could just hear, he muffled his head there as if talking to himself:

"Hmph, DNA testing or something, it's actually not necessary.

Big brother is big brother, it's big brother at any time, it has nothing to do with whether there is a blood connection or not......"

"Well, that's right, I'll always treat you as my own sister."

Chu Xuan took Ayase's words with a serious expression and promised her very solemnly.

But under normal circumstances, his words seem to bring a lot of trauma to the girl who musters up the courage to confess, and the effect is equivalent to lines such as "Actually, I have always regarded you as my own brother" and "You are a good person".

"Perverted, one or two are perverted......"

Ayase sighed as if she had been defeated, and muttered two words in her mouth, but she was clearly captured by Chu Xuan's enhanced hearing.

Although Chu Xuan was indeed unconscious during the period of strengthening and adjustment, he knew the reason for Ayase's somewhat headless words.

――Since Chu Xuan was able to install a surveillance camera outside the warehouse door, he was naturally able to install a surveillance camera inside the warehouse, so he also saw the very shameful declaration of the black cat in the surveillance record.

However, on the premise of always treating the other party as his own sister, he also openly showed the attitude of "I must marry my own sister", and it is considered that he likes to be a close relative of his sister the most~ It is also a matter of course that the perverted big brother who likes to be close to his sister ~ J.

Even Ayase was a little skeptical that if she lost her "biological sister" as a surname, her perverted big brother would still insist on being with her.

After all, her "congenital conditions" are not as good as Saori, the real daughter; And when it comes to the degree of compatibility with her eldest brother, she is far inferior to being at the same level as the "mad scientist" Chu Xuan, and the two of them can be described as the perfect "Fallen Saint of Chiba" black cat.

Perhaps, only by keeping her sister's surname can she occupy a place in Chu Xuan's back~palace.

Ayase, who had mixed feelings, sighed silently, and then pulled out the results issued by the DNA testing center from the envelope.

"We ...... Sure enough, they are no longer biological brothers and sisters...... Eldest brother...... Congratulations on your successful research......"

Tears suddenly and without warning fell from Ayase's eyes, and they flowed endlessly.

But it's not tears of joy or emotion.

For some reason, Ayase felt as if she had lost something very important in her heart, and she felt a very strong sadness for no apparent reason.

"Uh......h Eldest brother...... Woo...... Whining...... Big Brother ......"

After Ayase whimpered for a while, not only did she not calm down, but she felt even more sad, and finally cried like a child.

At this time, Chu Xuan's glasses reflexively sat next to Ayase, who was crying, and while stroking her head, he opened the task interface of the main god system.

――At the moment when Ayase's tears fell, the hint that the mission was completed finally appeared!

In the next two months, Chu Xuan's relationship with Black Cat and Saori was as close as ever.

And Ayase seemed to have completely returned to normal after that big cry, but she didn't show any obvious affection for Chu Xuan, just like he was still the eldest brother who was respected and loved by her.

In terms of feelings, Chu Xuan and the three of them are still in a tepid state.

During this period, it seemed to be between Kyosuke and his sister...... In short, Chu Xuan handed over the recording of his previous conversation with Manami to Kyosuke and Kirino, and told Kyosuke that if needed, he could ask him to help change to Yemeni nationality, and then he no longer cared about the indecent love of this real biological brother and sister.

On December 24, Christmas Eve, after Chu Xuan and all his friends had a Christmas party in the big house he "rented", Black Cat, Ayase and Saori stayed behind to help him clean up the messy living room.

When the three girls sat down to rest in the living room that had become neat and clean again, Chu Xuan didn't know where to take out three forms and put them in front of each of them along with the black signature pen.

"This is the marriage registration form in Yemen, as long as you sign your name and I send it to Yemen for registration, then legally we are already married.

I want you all to live happily ever after, so I want to marry all three of you, please marry me all! ”

At the same time, facing the three of them who were shy, Chu Xuan said a shameless marriage proposal very seriously.

"W-That...... You, your little lady of your heart, are grateful.

But I'm very sorry, the little girl is not ready to get married for the time being...... There is no self-confidence to be a qualified wife...... So...... I'm sorry! ”

After being silent for a while, Saori, who is usually the most weak and shy, was the first to give a refusal answer.

"Hmph...... So what...... I—I can't say yes for the time being.

It's just a legal marriage, but when you go to school or when you go to school, you have to write it on your school registration or other registration form, right?

Mom and Dad will be frightened. ”

Although the reasons were different, Ayase also followed Saori expressionlessly and rejected Chu Xuan's marriage proposal.

"Rustling ......"

At this moment, the black cat, who had been writing seriously just now, pushed the marriage registration form that had already filled in the name back in front of Chu Xuan, and said with a very middle smile:

"Huhuhu...... Finally, I will finally make a soul pact with you...... The sad wish of our generation for thousands of years is about to be realized.

But I swore it before—"

The middle two aura on the black cat's face suddenly completely dissipated, and he showed a somewhat shy smile at Chu Xuan, and once again loudly declared:

"--I like you.

I like it more than anyone else in the world.

I've always liked you, always, always.

With this intention, I will never lose to anyone.

Even if my body is destroyed, disappearing from the world...... I will definitely like you again in the next life. ”

(To be continued)