A Teacher's Sins is a text-based HTML adult game by TheSinningDev. You take the role of a professor newly hired by the Millennium Institute, a school setting where the world's greatest minds gather. Character creation lets you shape the protagonist, while play focuses on teaching students, gaining prestige, uncovering mysteries, and pursuing romance or other lewd situations.
Development is ongoing. The current public build is v0.0.8, released March 2, 2025, for Windows in English, with no censorship. The latest listed Patreon-only Alpha 0.0.10 update changed time to day sections like morning and afternoon, gave Stealth more uses including a new dorm entry, added a cafeteria NPC for illicit academic materials that can be sold and raise Dealing, and updated the UI.
Developer's description
Play as a newly hired professor of the Millennium Institute, home of the greatest minds in the world, where you will embark on a journey of teaching students, earning prestige, uncovering mysteries, and partaking in the lewd vices that surround you.
Alpha 0.0.10 -- Patreon Only
Reworked time system to use day sections (e.g. morning, afternoon, etc) instead of using real time.Added handful of uses for the Stealth skill, including a new method of entry into the dorms.Added NPC to cafeterium who unlocks the ability to create illicit academic materials, which can be sold to the NPC in question. Doing so increases the Dealing skill.Various UI changes.
Alpha 0.0.9 -- Patreon Only
NPC conversations now make use of Psychology subskillsAdded Dorm location in a preliminary form.
Alpha 0.0.8 -- 2/17/25 Public Release
Stats and Skills overhauled! Each Stat and Skill now also includes multiple substats/subskills. Updated Sidebar UI. Now including icons!Solve math theorems/conduct psych experiments for the Institute for money!
Alpha 0.0.7
Added a sex minigame! NPCs with a high love or lust score can now be seduced. Features currently limited.Gain exp during sex and improve NPC's feelings towards you by bringing them to climax, as well as lowering their stress.Introduced a new NPC, the Nurse, who can be met at the Infirmary.Speaking with the Nurse results in being offered a spot as their research subject. Accepting will lead to the first of several lewd and enticing events, as well as a steady income.
Alpha 0.0.6 -- 11/15/24
Changed the UI of NPC conversations and the Classroom.Added additional options for NPC conversations, including NPC reactions to some player actions.
Alpha 0.0.5 -- 8/26/24
Added an inventory system and several items for purchase in the Campus Store.Added consequences for mishandling Player status bars, which can result in a special event.
Alpha 0.0.4 -- 7/15/24
Added the first quest line, which involves the Headmaster and the Observatory.
Alpha 0.0.3 -- 6/6/24
Changed appearance of Stress/Hunger/Bladder/Arousal bars.Changed Campus Map UI and functionality, which also temporarily resolves a bug that prevented links from being used with the keyboard.Added alert to the sidebar on days class is scheduled.Added preliminary mood to NPC info during conversations.
Future Updates
Player reviews
Player rating1.5 / 5 · 2 ratings
Written reviews2 · avg 1.5★
Positive (4–5★)0%
Latest review2025-09-03
amgwtfover2025-09-03★★★★★
Feel like I say it so often these days, but I'll keep saying it until it stops; Make an actual game and not just a proof of concept before putting something out there expecting anything. As usual the only thing…
StitcherGeralf2025-09-02★★★★★
For a game asking for Patreon funding, it's extremely scuffed and borderline unplayable. The premise is generic and overall not really worth playtime. May adjust this review at a later date when more is released but as it stands, this…
★★★★★(2)
