Hi! I completely understand why you're asking, so let me give you clear answers to put your mind at ease.
- No NTR / Leaving for others: Regardless of your choices, none of the main heroines will ever end up with someone else, romantically or sexually. Bad choices or missteps will simply lock or close that specific romantic route.
- No Prostitution / OnlyFans: None of the main heroines are involved in anything like prostitution, OnlyFans, or MMF sharing.
- Regarding the villains... I can assure you of one thing: the Main Character will NEVER let ANYONE harm, touch, or take advantage of the girls.
Hope this reassures you! Have a great day and enjoy the game!