First-Person NSFW Simulation Game

I have a clear concept for a private, adults-only interactive simulation that plays from a first-person viewpoint on PC. The finished product should let me move freely through a 3D space, trigger erotic interactions with consenting characters, and adjust basic settings such as camera FOV, sound, and text prompts. I’m flexible on engine choice—Unity, Unreal, or any tool you prefer—as long as the final build runs smoothly on Windows without additional installs.

Here’s what I need delivered:
• A compiled PC executable and the full editable project files
• Simple menu or key-press system that lets me load scenes and restart them
• At least one fully functional environment and two animated characters to demonstrate the interaction loop
• Clear hand-off documentation so I can tweak assets or add new scenes later

All characters must be 18+ and meet legal compliance for explicit content. Beyond that, the art style, narrative hooks, and specific kinks are open for your creative input; I value suggestions on animation techniques, physics, or dialogue systems that enhance immersion.

Timeline and scope are negotiable once we discuss complexity, so include examples of comparable work—or a short demo—so I can gauge fit.

Useful link that doesn't download video to base story off of: https://hanime.tv/videos/hentai/pandemic-1?playlist_id=sflowryee4ngqndjyu62

Looking for pregnancy and as myself as main character. Story shouldn't stop at one place and a sandbox if possible can be added where I finish something I can keep cycling through different sex positions with the girl or girls. The plot can change if needed but hopefully keep it the same or around it.

Depending on the type of game it can be a city or town for me to explore and interact with the characters.