Stone Cold - Legends, #1

Stone is a Viscela, an alien from another planet destroyed by war, and a mercenary. Along with his two blood brothers, they travel around looking for work and end up stumbling upon something they were not expecting. Lena Kelly and her sister Mya are on the run from their brother and need help. Luck lands them a set of three Viscela's and one in particular has caught Lena's eye. The very second Stone sees Lena a strange pull begins to form deep within him.
A pull that gets stronger and stronger with each passing day. When the pull becomes too much for either one and they act on it their world is changed in ways neither could ever have been prepared. When Stone's past comes crashing back however, everything he holds dear is in jeopardy of being taken away from him forever. Lena included.