Adult PC Game: Janitor Legend 1.01 by Sanshoku Kobo Archive

This is a side-scrolling, 2D pixel art lifestyle simulation game.
The player takes on the role of the protagonist, who is stuck in a dead end in life and gradually becomes corrupted in order to satisfy his sexual desires.
Eventually, they will transform into people who will stop at nothing to satisfy their desires.​

Janitor Legend 1.01 by Sanshoku Kobo Gameplay Preview