Reincarnated as a Son of the Sword Saint and the Sage

A sword was coming at me with a speed even rogues could not perceive. My sister had reached the level of eight hundred and was capable of slashing her blade that fast without executing a technique, which made me proud of her. 

Her blade might be tremendously fast, however, the gift I secretly acquired from Mother was more than enough to enhance my perception and awareness to the point of stretching the time and seeing her blade run in slow motion. 

Being able to see the flow of her blade, I instantly conjured my crimson blade out of my Inventory. I coated my sword with Impregnable Fortress and then raised it diagonally to successfully block the lethal blade that was aiming at my neck. 

Ching! 

In spite of Sister activating the Absolute Severance of her blade, my blade completely prevented it from directly hitting my body because my skill neutralized the effect of her skill. Ultimate Art could only be intercepted by Ultimate Art. My defensive stats were higher than her attacks, so my blade was able to stop hers. 

Aside from that, I also deployed another Ultimate Art technique, the Infinity Barrier, to trap the powerful shockwave of our blades' collision. If I had not, the blast would resonate throughout the room, which could result in damage and injuries. 

"Not only Mom, but you fucked Mother as well?! How fucked up this family can be?!" 

"They both reciprocate my feelings for them, Sister. Mother also wanted to feel good and do it with me. It's the children's responsibility to help out their parents." 

Sister backed out her sword and raised it overhead to slash it at me again. I thrust my sword in response, not to stab her but to block her blade with my katana's tsuba. 

Afterwards, I forcefully parried her sword and brought it to the floor. She did not let go of her hands on the grip so she was dragged out as well. When the sword was already on the floor, I immediately stepped on it and pinned it down. 

"Let it go!" Sister shouted as she was forcefully trying to pull her sword out. "How did you become this strong in just a short time?!" 

"It doesn't matter how I got myself strong. It is no use, Sister." I stared her down. "I am much more powerful than you are right now." 

"I said, let go of the sword!" 

"I won't, Sister." I did not obey her order and refused it instead, and then I placed my blade a few centimeters above her nape. "I won't follow every one of your demands from now on. You cannot boss me around anymore, Sister." 

Sister was still trying to pull out her sword from my feet, but alas, all of her efforts were worthless if mine exceeded hers. In the end, she eventually gave up her strength and let go of the sword. 

"Why... Why are you doing this to me...? You have already hurt me; do you really want to suffer this much...?" 

As she was sitting on the floor, Sister asked those questions with a weak voice. Of course, I had a lot of empathy for her, but I was not going to feel sorry about what I had done. I think you should take a look at

"Sister, I want you to know that my affairs with Mom and Mother had nothing to do with my issue regarding Mary." 

"If you are indeed having affairs with them, that means Miss Gabrielle is also..." 

"Yes, she is involved and one of my women. Actually, I met her party somewhere, and somehow I became a lover of her and the other members before I did it with Mom. My first intercourse with Gabrielle was actually a foursome with Mom and Mother, and the rest is history." 

"...So they fell on Miss Gabrielle the more you did it, huh?" 

"Yeah, something like that. But including that, all I wish for is for you to accept our relationship." 

"Do you really think I can just accept it easily?" She then looked up and stared at me with moist eyes. "I left the family for about a year, and when I got back, you just suddenly declared making women out of Mom and Mother? Do you think it will be easy to digest it, let alone accept it?" 

Once she finished her words, I slowly withdrew my sword and gently kicked her sword away. She might pretend to be defenseless, and I had to be cautious. With her weapon out of her reach, I put my sword back in my subspace and kneeled down to level myself with her. 

"Sister, I know it is difficult to accept; what we did was utterly unacceptable and unethically gross after all. But we are fully committed to it, and we will drag it out for eternity." 

"Are you all really serious about it...?" 

"Yes, Sister, we are serious. We have reached this far, and it is impossible for us to back out." 

"But what about me...? Have you ever thought of my feelings? I am family as well, and I have the right to express my opinion and decide for the family." Sister brought her fist to her chest as she said that. 

"We are terribly sorry for not waiting for you; we were just being impatient. But that doesn't mean that we are going to completely disregard every one of your opinions. You are my sister, and your perspective matters." 

"...But you already did it with Mom and Mother, and I doubt that my words could even reach your ears. You are the winner here, Raphael; you already got what you desired..." 

Her eyes were a bit teary, and her emotions were mixing up. She was in a vulnerable state right now. However, a scum of myself saw it as an opportunity to seize her fragile and confused self. 

"Sister, I may have gotten Mom and Mother, but there are still things I want to get in the hands of..." 

As soon as I said that, I moved my right hand and straightforwardly grabbed her left hand. I pulled her hand closer to myself and then passionately gave it a kiss.