Black Dragon's Heart by Anita Philmar
Devoted chemist, Sarah VanHorn, lives for her research but fantasizes about loving Jake Ramsey. Her two worlds collide when the dragon center agent arrives to rescue her from the company suspected of producing chemicals dangerous to those with dragon blood. Sarah's not the only one with fantasies. Jake wants Sarah as his mate and he's waited years to claim her. Now, under his protective custody--not to mention the influence of Syndetic's sexual stimulant scenting the air--he can't resist the fiery temptation to finally make her his. But when tragedy strikes and their dreams are threatened, will Sarah sacrifice her career, Jake, and possibly her life to discover the answers? And will Jake let her?