Prison of Sissy [v1.3] [3KDesign]

November 14, 2026F95

In this game, a young man accidentally uses feminine medications, leading to the development of feminine traits.
In a desperate bid to escape this transformation and regain his former self, he needs a lot of money. After attempting to steal money, he ends up in prison, where the story unfolds, detailing how his femininity continues to evolve throughout the process.

Thread Updated: 2026-11-14

Release Date: 2026-06-24

Developer: 3KDesign Patreon – itch.io

Censored: No

Version: 1.3

OS: Windows, Linux, Mac, Android

Language: English

Genre:

3DCG, Anal Sex, Corruption, Gay, Groping, Handjob, Male Domination, Male Protagonist, Masturbation, Oral Sex, Sandbox, Sexual Harassment, Sissification, Transformation

Installation:

1. Extract and run.

Changelog:

v1.3

Full Story — Part 1.3
A complete new chapter with multiple scenes, choices, and two diverging paths inside the party.
Mini-Game — Plug Hunt
An interactive whack-a-mole mini-game built into the story. Speed increases as you progress.
Mission System
A new HUD tracks your active objective at all times.
Mission Notifications
Stylized popup notifications at key story moments, color-coded by urgency.
Sex Button Mission #8
A new client — quieter, more personal than the others.
Replay Gallery
All 8 Sex Button Mission chapters can now be replayed freely without affecting progress.
Elias Story — Chapter 2 Complete
The storyline continues. Chapter 3 arrives in the next update.
️ Part Select Menu
Start directly from Part 1.2 or 1.3 from the main menu.

v1.1
N/A

v1.0
N/A

v0.9
N/A

v0.8
N/A

v0.7
N/A

v0.6
What awaits you?
With the update coming at the end of this month, you will meet a person from the character’s previous life in Part 6, and with the challenge of that, it will become really necessary for you to change some things in your life!

Your work at Glory hole will now be different and you have also started your new job.
You are going to buy your first groceries.
You now have a work outfit.
More and more! Keep wait..

v0.5
N/A

v0.4
N/A

v0.3
N/A

v0.2 – 2024-10-04
The Prison manager wants to talk to you…

v0.1 – 2024-09-15
Initial release

Developer Notes:

Hello, I’m 3K. I’ve been working as a 3D artist using Blender and similar programs for about 4 years. Now, I’m combining my skills and storytelling with the Ren’Py engine to create games. Your support is crucial for me, as this is my only source of income. Thank you!

Additional information:

The game is currently in its beta version.
Your support will help me continue development.
I welcome any feedback and criticism you may have about the game. I hope you enjoy it!
New updates are released every month, bringing fresh scenes and new content to the game!

Features:

Feminine Transformation: Experience the journey of a young man whose accidental use of feminine drugs causes noticeable changes in his body.
Desperate Measures: Follow his attempts to obtain money to reverse his transformation, leading to a dramatic theft and subsequent imprisonment.
Prison Life: Explore the challenges and changes he faces while adapting to life behind bars, dealing with his evolving femininity and navigating the prison environment.