The same simply feudal society that already exists

You decide not to change the current system. You have the nobles eliminated, to be replaced with the families more in line with your own beliefs and more likely to stay loyal to you. The human-supremacist Lionhearts are replaced with the more egalitarian Silvertails, the honorable Redmanes are replaced with the more pragmatic Blackhares and the puritanical Pureshields are replaced with the more liberal Hearthborn, mainly because there's lots of prostitutes among their kin, and you like prostitutes. The system changes fairly easily, and things go back to normal-ish for the common folk, as you start reaping in the rewards of kingship, like food, wine, riches, and most importantly, endless people to fuck.

Of course, there's another benefit to keeping things the same system. There's an old system known the Lord's right, or the right of the first night, or some other bullshit. You don't exactly know what it means, but in practicality it lets you fuck any peasant girl you want on their wedding night. Now, barring make-up, a good diet or anything of the sort, there's a lot of really ugly peasants who you pass on, but fuck it, there's a few good ones. Speaking of, you have one such delightful girl to sample at the moment.

You stroll around your new room in the lord's manor, an uncorked bottle of wine in your hands. The young peasant girl kneeling in front of you, clad in a cheap white wedding dress, is fumbling with your penis. She's not particularly skilled, yanking it out of your pants harshly as you snarl in pain.

"Careful," you threaten.

The peasant girl's eyes flutter with terror, as you grab the back of her head, mashing her lips against the head of your penis. Her tongue flicks out, running along the head in an unskilled but nevertheless pleasing manner, as you shudder in enjoyment. You slowly relax, letting your cock slide deeper down her throat. Her throat muscles quickly tighten as you give a forward thrust, having her gag tightly on your cock. You push further, nearly causing her to vomit as her throat spasms, closing tightly around your cock as you groan in joy. She tries to pull back, but you grab the back of her hand, pulling a handful of hair and beginning to face fuck her to your ultimate pleasure. Pleasure rides through you, your hips rocking as you keep her mouth wrapped around your length.

Ready for more, you pull her head off, allowing her to cough up a mixture of spit and precum as she desperately tries to get a breath in. She begins to cough and splutter, desperately sucking in oxygen. Grabbing your cock, you motion to the large double bed in front of you, sitting there waiting for the next stage of the night.

"On the bed," you demand.

The bride looks up at her, nodding slowly. She stares up at you, before climbing up onto the bed. You flip her over onto her back, grabbing her wedding dress by the hem and yanking it up roughly, to reveal a pair of white cotton panties. Shame, you would've preferred lace, but you suppose you're lucky enough she wasn't so poor as to not fulfill the wedding dress kink.

"Pure as snow. Have you done this before?"

"No," a quiet voice comes back.

"Perfect," you grin.

Grabbing the waist of her, you thrust inside with a solid thrust, pushing deeply inside her. Your cock immediately comes face to face with her hymen, but you leave no time in thrusting ahead and piercing her hymen. She lets out a scream, her pussy muscles tightening as a stream of warm blood bursts out from your harshness. You grab her by the waste, thrusting forward as you quickly take up your pace, slamming back and forth inside her. You reach down, grabbing one of her boobs and squeezing tightly through the fabric of the dress, before pressing your lips against hers, your greedy tongue forcing your way into her mouth. It's not long before her tight pussy brings you close to orgasm. With your balls ready to release your load, you quickly pick a target.