Paranormal Nobles Series by S.J. Frost

Vampire prince, Valentin, wants the beautiful blood slave, Sebastian for himself, but when he frees him, danger comes from those who don't want to let Sebastian go. Three years ago, Sebastian Beaumont, was starving and struggling on the streets. An offer for safety and shelter was nothing but the lies of a vampire. Since then, he's been trapped, surrendering his blood and body as a blood slave to vampires, all for the hope of gaining one more day of life and maybe, someday, his freedom... moreVampire prince, Valentin, wants the beautiful blood slave, Sebastian for himself, but when he frees him, danger comes from those who don't want to let Sebastian go. Three years ago, Sebastian Beaumont, was starving and struggling on the streets. An offer for safety and shelter was nothing but the lies of a vampire. Since then, he's been trapped, surrendering his blood and body as a blood slave to vampires, all for the hope of gaining one more day of life and maybe, someday, his freedom.  Having crossed more than three hundred years of life, Valentin Wyndham, is a prince among vampires. Memories of betrayal still haunt him and love isn't something he seeks. When his need for blood becomes too strong, he breaks his usual habits and visits a blood house. Though he tries to resist, he can't help but be captivated by the beautiful Sebastian. Unable to deny the intensity between them, Valentin frees Sebastian from the blood house, but danger follows them both from those who don't want to let Sebastian go. less

As a witch, Calvin Blackwood knows the dangers of demons, but to save his brother, he's willing to enter into a deal with demon duke, Sal, and give him anything the demon wants in return, including himself. A month ago, Calvin Blackwood found himself in the company of vampires, having been hired to use his talent as a witch to summon a demon. That demon ended up saving his life. In the time since, he hasn't been able to forget about Sal... moreAs a witch, Calvin Blackwood knows the dangers of demons, but to save his brother, he's willing to enter into a deal with demon duke, Sal, and give him anything the demon wants in return, including himself. A month ago, Calvin Blackwood found himself in the company of vampires, having been hired to use his talent as a witch to summon a demon. That demon ended up saving his life. In the time since, he hasn't been able to forget about Sal. He knows entering a deal with a demon is dangerous, but to save his brother, binding himself to the beautiful demon might be worth the risk. Sal is a duke among demons. An immortal being, more powerful than a vampire, but who has one admitted weakness, a fondness for humans. When Calvin comes to him to make a deal, he's hesitant, but can't deny his need to be closer to him. He also knows if he doesn't help him, Calvin will summon another demon, and he knows all too well the treachery of his own kind. Desire and trust builds between Calvin and Sal. Their relationship grows, but so does a hidden threat, and it might take power greater than a demon duke to save them. It might take that of a witch. less

As a prince of demons, Sytri’s existence has been for one thing, power. He’s gained that in the demon realm, but his pursuit of it cost him something far greater…something he didn’t realize the value of until it was gone. When he first met vampire prince, Basil Warrick, in an instant he saw—and desired—to have once again all that he’d lost; friendship, companionship…love. Basil has lived for more than three hundred years, and quietly carries the scars left by the vampire who turned him... moreAs a prince of demons, Sytri’s existence has been for one thing, power. He’s gained that in the demon realm, but his pursuit of it cost him something far greater…something he didn’t realize the value of until it was gone. When he first met vampire prince, Basil Warrick, in an instant he saw—and desired—to have once again all that he’d lost; friendship, companionship…love. Basil has lived for more than three hundred years, and quietly carries the scars left by the vampire who turned him. Connecting with others has never been easy for him, but Sy’s sensual charm is more than he can resist. He knows Sy’s history of betrayal, and the demon is exactly what he shouldn’t want in his life, and yet, Sy is all he wants. The return of an old enemy of Basil’s brings painful memories and danger to him, and a new enemy of Sy’s threatens to take away what he’s gaining in his life. If their lives are to be eternally bound, the two princes must overcome the threats and challenges before them. less