Heart of Obsidian

A frozen wasteland above. A monster of liquid fire below. A destiny forged in stone. For three brutal winters beneath the permafrost, Sia has rationed heat and fought to keep her settlement's hydroponics alive. Sent into the toxic depths with a failing air scrubber, she reaches for a legendary heat-stone to save her people—only to wake Thane, an eight-foot titan of volcanic armor, molten veins, and possessive rage. Thane has waited in the dark for an eternity. The moment he tastes her blood, the primal link is forged: Mine. When her life-support gear chokes in the extreme environment, Thane breathes his own mineralized air directly into her lungs, initiating an irreversible biological adaptation. As her body evolves to survive the deep pressure and searing heat, Sia is caught between the cold betrayal of her settlement's leaders and the overwhelming devotion of the beast below. Deep in the volcanic fault lines, their passion awakens an ancient power—and yields an impossible child of fire and obsidian. Heart of Obsidian is an explicit standalone monster sci-fi romance featuring a possessive elemental hero, forced proximity, intense body transformation, egg-laying/pregnancy themes, and a fierce heroine fighting for survival.