~My wife~ Impregnated for the kingdom's sake

For the future of their kingdom, the protagonist's wife submits her body to the King. - Assist her babymaking efforts, as a husband and as an alchemist. The King doesn't have any offspring. - Without an heir to the throne, the Kingdom faces a dire crisis! The only hope is Luna... but she is already married... - During the weekdays, collect materials and create items. Then go watch as your wife gets f*cked on the weekend!