Grigor by Carole Mortimer

Grigor Pendragon is nearer to turning feral than any of his brothers, of making that final shift and remaining in his dragon form. If— When this happens, his brothers will have no choice but to kill him, before he harms any humans, who for sixteen hundred years haven’t known of their existence.

The only thing that will stop Grigor’s last and fatal shift is meeting and claiming his fated mate, the one woman meant just for him.
Gayle Wilson is independent and outspoken, a computer geek, and she has no idea her sister, Holly, is now the mate of a dragon shifter, or that Dylan’s seven brothers are also dragon shifters.

What she does know is that she’s being kept a virtual prisoner at Pendragon Castle, the family’s home in North Wales, until her sister comes back from her trip away with Dylan. Gayle isn’t at all impressed when Grigor, the eldest Pendragon brother, announces she belongs to him now, and then expects her to do exactly what he tells her to do. Admittedly, he’s tall—very!—dark, and handsome, with muscles that go on for miles, but there’s no way she’s going to belong to anyone, least of all the arrogant and cold Grigor Pendragon. The first opportunity she gets she’s getting out of there and going back to London, and to hell with the whole of the Pendragon family.

But when danger starts stalking her, Grigor is the only one she can turn to for help.