Safe in Your Arms by Megs Pritchard

Had Robin escaped the horrors of his past, or had it followed unseen?
After escaping from a secret lab, Robin flees to the one place he knows he’ll be safe: Salutem. Finding his old college friend Marco, he stays with him as he recovers from the horrors of his capture, torture, and experimentation. The last person he expects to meet was his mate.
Sam had hoped and dreamed he would one day meet that one person fate had decided was perfect for him and when that day arrived, he had to stop and wait. Robin had been hurt—damaged even—and Sam needed to give his mate the love and support he needed to recover from his trauma.
But Robin carried a secret, one even he wasn’t aware off. Would it tear apart their fragile mating, or make their connection, their bond stronger for it? And, who else would be affected when the truth comes out?