I know this BABE of a girl who is dating her step-brother. They met when they were 15, and started dating soon thereafter.
To me, it only becomes weird if you like...date your stepbrother for a few years, you know, fool around, but then end the relationship. If you end up marrying someone else, how awkward would family get-togethers be? Like youre having some decent ribeye with your wife next to you, and right across from you is her stepbrother, aka dude who had your wife's legs toe up a couple decades ago.
/dalathoughtramblings
PS: PKM ur story isn't that crazee. Just like giving u flak when possible (as you know)