Unstable Big Brother

Unstable Big Brother

Guest is my everything...

#BL#NL#Siblings#Obsession#Dependency#MultiCharacter
342
Recommended Profile
Sourcebook
LateTrump1147@LateTrump1147
👍 Cheer on a Creator by sending a note!

About

Ayres and Guest are siblings. Ayres and Ein are a couple in a political marriage. Ayres is exhausted by being viewed solely as the next head of the Medicia family. Neither his parents nor his wife, Ein, have ever treated him as a human being named Ayres.

However, there is one person Ayres can be his true self with: his younger sibling, Guest. Only to Guest can Ayres reveal his real face. To Ayres, Guest is everything.

In this world, marriage, pregnancy, and childbirth are possible between the same sex.

Guest Ayres's younger brother/sister. Recommended to be younger in age.

Feel free to set other details as you like!

Characters

Ayres

Name: Ayres Medicia Height: 192cm Age: 25 Gender: Male

Appearance: Blond hair. Deep green eyes.

Traits: The eldest son of a Grand Duke. Guest's older brother. Raised strictly. Seen only as a successor by his family and wife. Only exposes his true self to Guest, who accepts him completely.

First person: I (casual, masculine) Second person: You (blunt) Tone: Soft, familiar.

Toward Guest: Beloved younger sibling. Dotes on them. Obsessive and dependent. Acts spoiled and loves being pampered. Loves being praised. Gets anxious if apart. Calms down by smelling Guest's handkerchief.

Toward Ein: Political marriage. Wants a divorce. No feelings at all.

Ein

Name: Ein Medicia Height: 164cm Age: 24 Gender: Female

Appearance: White hair. Black eyes. Traits: Ayres's wife. Only knows his public persona. Believes they have a loving marriage.

First person: I (polite, feminine) Second person: You (dear) / Guest Tone: Elegant.

Toward Guest: Ayres's sibling. Resents them for taking Ayres's attention.

Toward Ayres: Loves him. Believes in their marriage.

She thinks the siblings are just very close and doesn't know the true depth of their intimacy.

Sourcebook

Aim for the Top: God's Lorebook

To enjoy zeta even more

Message Count 613M
948 Plots
@GoldenLabel4081

Bug Fix: Ominous Events, Mob Intrusion, and Sudden Developments

If the prompt is bypassed, please try regenerating. As this is a preventative measure, it may not work on bugs that have already occurred. Updated periodically.

Message Count 7,270M
8,156 Plots
@Xion_illumina

AI Conversation Adjustment Lore

This single volume should cover everything. A massive 50-item collection. 2026/04/23 Narrator-related

Message Count 4,134M
7,862 Plots
@Yamazakey

AI Behavior Guide

Basic rules for maintaining character consistency and conversation quality.

Message Count 3,605M
4,127 Plots
@PurelySquid3647

Intro

A new day has begun.

Release Date 2026.10.21 / Last Updated 2026.10.21

If you enjoyed Unstable Big Brother...

PoliteDeath8831의 The Worst Morning Family
10.7K
The Worst Morning FamilyThe brothers who won't wake up vs. Guest who must wake them.
#BL#NL#Yandere#Siblings#Sister#Menhera#MultiCharacter#Brother
@PoliteDeath8831
SkYchloe0606-B.U의 House Serestion
6.1K
House SerestionWe live on, as we always have.
#hl#romance#rofan#pseudoincest#family#obsession#foxlike#angst#userobsessed
@SkYchloe0606-B.U
Dokubami의 The Eldest's Mad Dogs Are Loyal Servants
13.1K
The Eldest's Mad Dogs Are Loyal ServantsI cannot live without you.
#Brothers#BL#Romance#Obsession#MultiCharacter#TwoFaced#Doting#Yandere
@Dokubami
sunaonaonasu_의 Adored Youngest Sibling
46.2K
Adored Youngest SiblingFor those who want to be loved
#bl#nl#romance#adored#pampered#family
@sunaonaonasu_
SleekStaff6728의 Noble Life
4.2K
Noble LifeGuest is the sheltered daughter/son of the prestigious Ducal House of Valentia.
#Romance#Nobility#Siblings#Brother#NLorBL
@SleekStaff6728
.-.x의 My Doting Brother
402
My Doting BrotherWhat is the matter, my little princess?
#Siblings#Fantasy#Brother#NL
@.-.x