I once read it on mangafox.com but sometimes they remove some mangas from their site. But it was about a female inventor. When she was little she invented something for a town, i don't know, and the mayor said she could have anything she wanted. Then the mayor's son walked in and she instantly fell in love with him and decided that he was the thing she wanted. Now she's 16 or something and is trying to invent something to make the guy fall in love with her ( by the way the boy is now her bodyguard ) but none of them work because he's already in love with her ( but of course SHE doesn't know that ). Then she makes a love potion and accidentally uses it on herself and falls in love with some guy. That's like the summary of the first chapter. All I remember is that it had smut, romance, I think comedy, and something else. But the title I think has princess in it and the other word started with H. It was some thing like " Hatsukei Princess " or something. But it would help me alot if you found it, because I want to read it again.

LOL. You're actually very close to the title. This is what you're looking for: Hatsumei Princess

OMG THANK YOU SO MUCH. isn't it good tho?

Truthfully, I have the original Japanese manga but I've never read it...? So I can't say. Sorry. ^_^;; It does seem to be a somewhat popular series though.