I kind of wish this "game" was actually a game.
Example would be MC wins a ticket to go to this park. It is good for a 1 day pass however the MC can do something to upgrade for a golden 1 day pass.
The normal pass allows the MC to use the park as general, the golden is for the inclusion of employees within the company that runs/owns the park or suppliers on the park grounds. This is for people who want to have more reluctant women in the mix (this can run the gamut from just normal netori to rape).
MC has to play these games/rides/whatever to win the chance to impregnate a lady. So minigames to do such a thing. At the end of the day the MC finds out how many he has successfully impregnated, at this point if the number is 0 you get a game over, if the number is a low number but still above 0 then MC goes home but now the ladies he did impregnate can move in with him. If he has a high number he may go for a day 2, and if similar happens the next day he can stay for a final day. Once MC goes home the game would turn into more of a VN/Haramase Sim where romance/corruption/whatever and the like will take place, plus MC needing money to fund growing family, so jobs and other fun stuff.
The next year the women who gave birth could decide to go back to the park or if romanced/whatever enough stay with MC. The MC will be able to go back to the park 1 year after his last visit if he either has a high affinity with the ladies be it through romance, convincing, or if he was a "high scorer" in the impregging the previous visit. 2nd time happens and same concept but with different ladies and games, repeat cycle and on 3rd year if MC does extremely well (All time high score) his pass is extended to be 1 visit a year for life and now also allows the impreg of any woman of age on the park grounds whether they are part of the amusement or not and family members or women of age of anyone who has a connection to the park. This would also turn the homes/offices into "satellite parks" to include any women visiting the homes of a park employee.
Then again more Romance/other game section etc.
End of game.
This would allow for a huge amount of differing women/body types/positions/personalities/etc.
Hell it could feed into a game like Sengoku Neet where you and your harem must take over other locations/harems, or something like gaining the for life ticket instead equals an impregnation license similar to haramase sim, and then extends throughout the country, and can include incest or whatever.