My Junior Sister Keeps Trying to Ruin My Heartless Dao

[Tentatively first person; may be changed to third person later]

The person I detest most is my junior sister.

She has exceptional talent, and every time we spar, I lose to her sword.

I practice sword moves over and over late into the night. She says, "Senior Sister, you should get some rest."

How wicked of her. She doesn't want me to work hard and surpass her.

I cultivate the Heartless Dao. She says that only by going through a tribulation of love can I see through matters of the heart.

I went down the mountain to undergo my tribulation, and she insisted on coming along.

She must be deliberately ruining my plans, afraid that once I succeed in my tribulation, I'll become stronger than her.

*

It turns out my junior sister is a remnant of the demon clan.

Surrounded and attacked by everyone, she was gravely wounded, and my master ordered me to keep watch over her.

She said, "To die by Senior Sister's sword would be the greatest fortune of my life."

I knew this was just her soft-hearted persuasion tactic.

I secretly let her go.

It wasn't because I couldn't bear to do it. I simply hadn't defeated her yet, so she couldn't die.

I made a terrible mistake, and my master punished me with three years of reflection.

When the three years were up, I went alone to the demon clan, determined to defeat my junior sister.

She said, "Wu Xingjin, you shouldn't call me your junior sister!"

What utter nonsense!

I was the one who found her in the snow all those years ago and cared for her so devotedly. Now that she's become the Demon Lord, she won't even let me call her junior sister.

*

Once again, I lost to my junior sister's sword.

When I woke up, I had lost all my memories, and only my junior sister was by my side.

She said she was my wife.

I loved her very much, and she loved me very much too.

We spent a simple, ordinary stretch of time together.

Then my master came looking for me and helped me regain my memories.

My cultivation was even greater than before, so I went to the demon clan once more.

But my junior sister appeared with a pregnant belly. She asked, "Do you hate me?"

What a strange question.

I only wanted to defeat her.

My junior sister's cultivation had greatly weakened because of her pregnancy. I wanted to wait until she gave birth and regained her strength before fighting her again.

So I stayed in the demon clan.

She said the demon clan had a dual cultivation method that could increase one's cultivation.

I had always disdained such underhanded methods.

She lay on my bed and pleaded with me in a soft voice.

The only reason I agreed was so she could give birth safely, and then I could defeat her!

*

I still couldn't defeat my junior sister.

Whenever I wanted to spar with her, either her chest or her head would hurt, and in the end she would always pull me into bed.

She said that her cultivation reached its peak after she was satisfied.

Clearly, she was lying.

Every time, once she was satisfied, she would say she had no strength left and that we'd spar next time!

Junior sister's perspective:

Before my master went into seclusion, she warned me not to ruin Senior Sister's Heartless Dao.

I said, "I'll make Senior Sister fall in love with me, then kill myself to prove my Dao!"

My master looked at me as if I were crazy.

A devoted-to-becoming-stronger, irresistibly charming, powerful and beautiful top who attacks * the world's strongest, sickly, love-addled bottom who receives,

Top's perspective, the top is strong, but the bottom is even stronger. The hatred is fake; at heart, they dote on each other.

Theme: Strive to become stronger.