It sounds like you're referring to a specific adult or erotic visual novel / RPG maker game, likely titled Succubus Affection (sometimes stylized as Succubus Affection or Succubus×Affection). The "finished version 109e" suggests you've found either a complete release or a particular build (version 1.09e) of the game.
Succubus Affection is a side-scrolling action RPG where players take on the role of a young man in a world of human-like monsters. He must train and grow stronger to protect himself and his doting succubus sister, Irys, from aggressive monster girls. succubus affection finished version 109e
Succubus Affection is a 2D side-scrolling action RPG published by Kagura Games that combines real-time combat with monster-collecting elements. The "finished version 109e" (often referred to as the final stable build) represents the complete experience, including all post-launch refinements and mechanics. Core Gameplay Mechanics It sounds like you're referring to a specific
Irys: The protagonist's sister who seeks to unravel the mystery of his existence as one of the last known humans. He must train and grow stronger to protect
A common complaint was that art and CGs were locked behind obscure achievements. In 109e, the Gallery unlocks progressively by simply playing the story. The Music Player includes two new ambient tracks: “Devotion’s Price” and “The Threshold.”
The Evolution of the Monstrous Heroine: An Analysis of Succubus Affection