Freedom

A dark guild kidnaps all the dragon slayers and tortures them, trying to force them to teach them their magic. But they can't. Only dragons and lacrima can. After months upon months of torture Cobra starts a riot to save Natsu, but the two get separated and dumped outside a town. Traumatized and sick of magic the two forget about their previous lives and start a new one here in this town. (Has female Natsu in it part way through)