Winter's Mate: Fated on Ice
I felt my face burning with embarrassment at having to explain this.
“It’s a swelling at the base of my cock that happens when I’m inside you, and it locks us together for a few hours depending on how strong the mating instinct is, and it’s meant to ensure conception by keeping my cum inside you so nothing spills out.” I rushed out, then watched her face carefully for any sign of fear or disgust, but she just looked aroused.
“That sounds…intense,” she whispered.
“It is,” I admitted. “And there’s also something called a rut, where the need to breed becomes overwhelming, and I lose most of my higher thinking and just become focused on mating and knotting you over and over until the rut passes,