He absolutely should agree. Not only... dat ass, but she's also highly intelligent and a very promising voodoo practitioner indeed.
Although for the sake of his modern mentality, if he wanted to wait a couple of years for her to grow up more, it would be understandable. She wouldn't necessarily fully understand as I believe by that ancient world's standards she would be at a perfectly marriageable age already, but no doubt she would be patient if she knew it's only a matter of time.