Master of Frost by Terry Bolryder

Dmitri, newly awakened ice dragon and former bodyguard to the Lord of Winter, is in big trouble. He knows his curvy, prone-to-trouble roommate with a heart of gold is his mate, but she hasn’t come to the same conclusion. If he makes a move she might freeze him out, and if he doesn’t, he might be forever doomed to the friend box, a place colder than the Siberian landscape he came from.
Chelle loves living with her two new friends, even if they are giant, sexy icemen her roommate brought home from a lab. Dmitry, a tall, sensual warrior with vivid turquoise eyes, always sets her on edge when he’s in the room with her, but she knows everything will be fine as long as the two of them stay just friends. That’s if she can ignore her body begging for so much more…
As tension explodes between the two roommates, resulting in heated kisses and steamy encounters, Dmitry is ever more determined to melt down the icy walls that guard Chelle’s heart. But in the end, it may be up to Chelle to fight her inner demons and realize her feelings for Dmitry, before external forces tracking the ice dragons catch up.