I am not following in regards to the feat you are referring to, I might need a follow up on that. I have just always thought of dragonborn as mamillian, instead of reptilian creatures, as while they lay eggs, they nurse their young and have warm blood, much like the platypus. So lorewise, my character would be the daughter of dragonborn woman, and a wizard with a uncanny interest and proficiency in inter-species breeding. After a few years the adventuring wizard grew bored with living in a little town with his wife, running a store for alchemical and herbal goods, and so he left for a little adventure, but never returned. Thus, to help support the household, the half dragonborn took to hunting, as many others in the little forest town did. I could just use the dragonborn race, but it seems weird for a hybrid to be able to manifest a breath attack.