But I suppose it'd go wherever dragon souls go while they're not being reincarnated. Assuming it's not absorbed. As far as I know, the Dragonborn's soul is no different than the ones you're absorbing. --- Look, for the last time: Kirby has explained it over and over! http://i279.photobucket.com/albums/kk138/Schesparn/11911255317531.gif
I can think of more Dragonborns: the entire line of Septim Emperors, and likely the Nerevarine as well.
The character from Morrowind. Part of the prophecy around it refers to the Nerevarine as being 'Dragon Born'.
Might you have a reference for this, good sir?
It's right here: http://www.uesp.net/wiki/Morrowind:The_Lost_Prophecy
Did you read that article? Within it explains that "Dragon-born" as written means "born under the sign of the Dragon," i.e. born in an Imperial province. --- Release your life; take your place inside the fire with her...