Played this RPG Maker game:
For the Kingdom, A Wife has Babymaking Sex with the King
https://www.anonym.to/?http://www.dlsite.com/ecchi-eng/work/=/product_id/RE195247.html
Self-explanatory based on the title. The king requires a heir and the protagonist's wife is chosen, for not very good reasons IIRC but it's NTR so it works. There's a countdown of 100 days, the wife visits the royal chambers every Sunday night, and the rest of the days can be spent mainly gathering items, spending quality time together, or having sex at night with a condom.
It's very grindy when it comes to gathering items, best explained here:
http://www.ulmf.org/bbs/showpost.php?p=955931&postcount=3
Essential items being condoms, aphrodisiac, and viagara. Other sex related items can be collected effectively on a weekly basis or though 3 quests. The husband, an alchemist, can secretly watch using a mirror that's obtainable after the first Sunday. New Game+ preserves all unused items, key items, and the lewd acts permissible by the wife.
The art isn't stellar, it is fairly grindy, and everything is as predictable as you'd expect it to be from such a title, BUT~! I'm a bit of a sucker for these types of netorase RPG Maker games; kind of iffy on the VN equivalents, but RPGM? Count me in!
I had fun more or less until I exhausted all the obvious H-scenes and reactions. Not a must play, but I'd still recommend it unless you have something more urgent in store.