It sounds like you're looking for a for games similar to those by NTRman (a developer known for adult visual novels with Netorare / cheating themes, often in 2D CG or RPG Maker style).
Disclaimer: All games listed are for adults 18+. Please support the original developers, especially NTRMAN (follow him on Patreon/Itch). game like ntrman
The antagonists in NTRMAN games are rarely charming rivals; they are often portrayed as grotesque, overpowering, or socially dominant figures (the "Bull"). Visually, they are designed to be intrusive. The stark contrast between the often soft, innocent design of the female partners and the aggressive, heavy-set design of the antagonists serves a narrative purpose: it visualizes the corruption of purity. It sounds like you're looking for a for