Ronan

Healer meets hybrid and lives change.
Thirty years ago, the Zuvgran released a virus that killed most Svesti females and rendered the remainder infertile. The Svesti initiate first contact with Earth when their scientists discover that humans and Svesti can interbreed. Humans may be able to save the warrior species that has been protecting Earth's region of space for a century.

Natasha is a Russian doctor who is fascinated with all the new medical technology and techniques she's learning from the Svesti, as well as alien biology.
Ronan is a hybrid with a huge secret and needs a healer to help. So he kidnaps Natasha.

Ronan is the fourth book in the Svesti Fated Mates series with a HEA and can be read as a standalone, although it is recommended that the books be read in order for the best experience.