Vampires are cold-blooded, and have long lost the ability to generate heat of their own, so when they do find themselves in the lulling caress of warmth, they are intoxicated by it all the more fervently.
So when Vincent first found Lovely, and held them in his arms for the first time {and held someone in his arms for the first time since his turning}, their warmth cascaded through his body and seeped into the cracks formed by the crash, and for the first time since his rebirth he felt like he was complete.
So when Sam is smothered by Darlin's wolfen cuddles, and engulfed in a sea of fur and paws and thumping tails and soft, sweet purrs; he cards his hands through their coat as he buries his head further into the crook of their neck, and knows that in this bubble of warmth and love, both him and his mate are safest, home, and inescapably in love.
So when Porter -who is so used to the frigid chill of shadows and blades- lets his Treasure feather currents of heat across his stiff, scarred body, and finds that their touch makes his shoulders droop further down than he had ever thought possible, and when he feels every muscle in his body be coaxed into blissful relaxation when his love presses kisses into the crown of his head and murmurs sweet nothings into his ears, when his arms are around them and he is lost to their ethereal tides of heady warmth, he knows he has found love so reverent- so sacred he never knew it possible, and he knows he would sooner die than ever abandon his god.