>>11359287
Granted! You are reborn in another world where monsters like oni exist, and get a red oni husbando who is impulsive, passionate, a bit of a himbo, but also loving.
You are reborn as a cute maiden who is offered to him as a human/oni peace offering.
Being isekai'd and having no living relatives made the decision REALLY easy for the villagers, it's like you were made for this. However, he's not your everyday oni, as I said earlier. He's just as willing in this as you are. He's a prince, and if he refused you, his father would take seven brides instead just to make a point.
...So it's a good thing you have a thing for big, soft monstermen. He'll believe the story of you being isekai'd, laughing at it, and laughing HARDER if you tell him you wished for a big husband... before blushing when he realizes you're serious.
You'll have access to magic to temporarily switch your sex if you'd like, especially if you say you were a boy, or would like to be one... but making you a maiden with a stretchy pussy was for your own good.
Whether it's your libido, or a trait of him being an oni, you'll be entranced by his cock. You'll NEED it inside of you... and being an oni, he'll need something to fuck. There's just a small problem... though if you ask him, he'd call it a "large" problem. He's massive. You don't get extreme levels of porn physics (though you get some). He is not TOO big for you physically, but he will be the tightest fit you'll ever experience without being split in two. Your first time with him, just getting it in will be a chore. He'll lay down for you and let you lower yourself onto it at your own pace, jokingly saying stuff like "Good girl" whenever you take a little more, but stopping you if you seem like you're hurting yourself.
If you want a big monsterman, you're gonna need to train for that big mosntercock. Each night, you'll get a little better, until you can eventually take it to the hilt. He'll celebrate by keeping it inside of you.