So the idea goes like this tsuna decided fairly young that he wanted to be a present parent and not abandon his mother or his future spouse. My thought was that instead of being fully male and only able to have children with a woman instead he's a hermaphrodite but it not up to me, could be male, could be female it's all up to you. I do want Reborn to be flabbergasted to some degree that tsuna has already been working towards this goal with writing drafts of marriage contracts and studying parenting books and relationship books. You can have tsuna sealed or not. But don't give him a full set of guardians before Reborn gets there. I do want him to be in home economics in school and not be super popular in school but as I said it's up to you. My personal favorites for match making for Tsuna are Xanxus or Kyouya but if it's not to your tastes pick your favorite pairing and run with it. I'd like to see Tsuna's dad flabbergasted and upset because I really dislike him but I think that inside of these circumstances he would be.