Until Forever

From RomanceWiki

Author: Johanna Lindsey
Publisher: Avon
Year: 1995
Amazon Listing - Until Forever

Professor Roseleen White has acquired an ancient Scandinavian sword -- and its Viking owner. Cursed and held captive for centuries, now Thorn is enslaved to Roseleen -- though she's the one who feels like the captive. Thorn, brother of the Norse god Thor, and Roseleen travel back into time, screwing up history as they go.