Tie her, found out.

"Don't, don't..." his mom moans as she could feel the knot bumping against her entrance.

"Here it comes." Dexter groans out as he thrusts hard once again, pushing hard as his knot makes a loud audible pop as it pushes past the entrance and inflating inside of his mom, tying them together.

He moans as her walls clamp down around his knot and cock, milking him as his cock throbs inside of her, his tip pushed up against the entrance of her womb. Thick ropes of cum filling her womb as he holds onto her tail to keep her from pulling away as he fulls her. "We can do this as much as I want until you have my pups." He pants as he grinds his hips against her ass.

"Well what do we have here? Not what I was expecting for breakfast." The sound of his dad's voice comes from the doorway. Dexter looks back to see his dad's agry face.