What Do I Do Now That My Ex-Boyfriend and I Are Siblings?

An adversarial "brother and sister"

Aggressive but easily flustered younger sister x depraved older brother with no morals

One day, a help post on a social media app gets boosted.

[Help! What do I do if my brother's kink is pseudo-incest?]

Soon, people reply.

[Everyone has kinks. What's the big deal? Respect people's kinks.]

[OP, you're being way too nosy. What does your brother's kink have to do with you?]

[...]

[But is OP a guy or a girl?]

[Girl]

[Uh... then how do you know your brother's kink?]

No one replies.

Later, someone bumps the post.

[Sorry to ask, but are you and your brother biological siblings?]

[...]

[Not biological.]

[I think I get it.]

[I think I get it too.]

[?]

[Is nobody going to answer OP? Not a word?]

[Exactly, if no one's saying anything, then I'm not saying anything either.]

[If you won't say it, neither will I.]

*

Chen Qingnan never imagined that the melodramatic switched-at-birth trope from novels would happen to her.

At eighteen, her birth parents found her. Though she was reluctant, she couldn't resist the temptation, and decided to go home with them.

On the way back to the city, she learned she had an older brother, not related by blood but closer than family. Her parents hoped she and her brother would get along.

With nowhere else to go, Chen Qingnan naturally agreed.

She just never expected to nearly faint the moment she laid eyes on him...

"Little sister." The man before her was cool and distinguished. He smiled warmly and held out a welcome gift.

Chen Qingnan stiffly took it, too stunned to make a sound.

Only one thought remained in her mind:

Could someone tell her why this guy looked exactly like the online boyfriend she'd unilaterally broken up with?!!

Later, after starting university, Chen Qingnan grew increasingly troubled. Nearly every post she made from her burner account was a plea for advice.

One day, as usual, her clingy brother sidled up to her. Her sense of morality brought her back to her senses, and she was about to scold him when the phone in front of her caught her attention.

Shang Xingyuan held her in his arms with one hand, his warm breath brushing her ear as he scrolled through the phone with the other.

The contents of her help post slid past her eyes. A bewitching voice sounded beside her ear: "Little sister, you got the title wrong."

"..."

"You should have written, 'What do I do if I'm my brother's kink?'"

Blurb subject to change

*The leads are not related by blood and are not registered in the same household.

Theme: Live earnestly