His knot slipped inside her, stretching her walls to their limits, the thrumming pleasure slowly becoming a burning pain. Ellen clenched her jaw and squeezed her eyes shut, her dull nails digging into the fur of his muscled abdomen as she tried to bare with the pain. His knot swelled inside her and his length grew with it, penetrating her deeper—almost too deep.
Ellen fell on him, every part of her torso pressed against his as she wrapped her stripped arms around his neck, her body trembling. "Durham," she mewled into his neck, clinging onto him as his knot swelled and swelled inside her.
"I'm sorry," he whispered, swallowing his own growl of pleasure and pain. Her walls were tight and squeezed down on his knot as it swelled. But he knew his pain paled in comparison to hers. Ellen was a virgin and her anatomy was not made for a canine knot. He stroked his hand down her back, giving her small kisses on the side of her face. "I'm sorry." He whispered again.
"Don't say sorry." She slowly lifted her head from his neck, her beautiful, watery eyes meeting his. "I want this," she said, giving him a peck on the lips. "I want you."