1. It wasn't by "force" from Sanji's perspective and from Pudding's perspective they were going to kill Sanji. After she met and fell in love with him it wasn't by "force" either.
2. It isn't meant to be viewed with an American centric perspective anyway, this is meant to be viewed from a Japanese perspective where it is totally fine, whether it's "creepy" to you or not doesn't make it "creepy" universally, you are merely stating an opinion influenced by your culture and imposing that onto other cultures, which is pretty creepy to me.
3. It wasn't "messing around" it was marriage.