Always His

They have always been the same... 
And they have always been together.
But one of those things is about to change.
Shane and Timothy are identical twins, only things have been a little off since Tim presented as alpha. 
But Shane knows being a beta is only temporary and he will catch up with Tim again. In fact, he's pretty sure it won't be long before he presents himself… 
But the itching Shane can feel under his skin announces a very different kind of transformation, one that means his relationship with his brother will never be the same again.
Can their unique bond survive the effects of the full moon? And can they find a way to live their lives together when it's forever?

A/B/O, accidental sex and mating, mpreg, angst.