インモラル・リトルDS（Immoral Little DS）

The protagonist, Kazuma Kisakata, was working as a temporary dorm supervisor at the private Hasuikenan Academy (nicknamed "Hasunan"), taking full charge of cleaning, laundry, meal prep for club members, night shifts, and other dorm duties.

Then came April—and with it, two girls moved in, turning his life completely upside down. While cleaning the room of one of the girls, Sae, he accidentally stumbled upon her underwear. Just as he picked it up, misfortune struck—Sae herself caught him in the act, branding him a panty thief.

"Keep quiet and do as I say," Sae ordered, turning Kazuma into her personal plaything.

But that wasn't the end of it—the other girl, Nonoka, happened to walk in on them...
Between the two of them, they dragged out his innermost masochistic nature.
And so began his twisted new life.
As the new school term settled into a steady rhythm, with studies no longer a pressing concern—
Sae and Nonoka, though restless with jealousy at the thought of Kazuma's eyes wandering, schemed on how to tempt him further—especially after seeing his reaction to their school swimsuits.
Kazuma would be teased, bullied, and utterly drained.
To be stepped on, scolded, toyed with, degraded—
Every moment with them was a fulfillment of his deepest desires.

[Translated from Digiket]