Iris had been neutered, but when he merged with Jen, it was like all those years of absent male rutting had reawakened, and had pent up into this single moment. Jen pounced on her mother from behind...or was it her master? The confusion gave her pause, but was quickly pushed out of her mind as her right tapered cock caught between her mother's shirt and her back. Immediately, Jen began rutting against the back of her mother's body like the dog she partially now was, her added mass easily pushing her down onto the kitchen floor.
Jen's tongue lolled out of her muzzle as her rational mind gave way to the building pleasure of ravaging her own mother like an animal. Her powerful tail provided all the support her upper body needed as she reached for her left cock with both hands and sandwiched it between her six breasts. The tip of the massive organ sat in front of her face, and she lapped at it her dog tongue, drinking in the copious pre-cum flowing of its tip. Jen gyrated her hips rhythmically in this fashion, her upper body angling slightly to the left of her prone mother who remained oddly silent.
With one last thrust, Jen hugged her left cock tightly against her body and howled as she came massively from both cocks, one after the other. Thick ropes of cum splashed against the bottom of her muzzle and face from her left cock, running down her front in great rivulets, only becoming distinguishable from her white fur from where it matted it. Jen savored the salty taste of what entered her mouth. At the same time, her right cock drenched her mother in cum. The shirt caught most of Jen's cum, distending with each ejaculation to form a growing puddle of cum on the floor around her from where it escaped. Much of Jen's powerful ejaculations nevertheless went through the shirt, landing in great splotches against the nearby cabinet and onto her mother's hair. This continued for what seemed like minutes, and by the time she was finished, there must have been gallons of the stuff everywhere. Jen fell forward onto the floor on top of her mother in exhaustion. Yet her cocks remained distended as ever, knots inflated, cum still pulsing outward slowly with residual mini-ejaculations. Jen knew it would be several minutes before the knots would actually go back down. She would have to thank her master later, although she knew she shouldn't have made that mess.
Master? Jen's half-closed eyes shot open as she realized her own thoughts been her dog's, and the fearful truth of what she had just done set in. The person she had just masturbated onto wasn't her master; she was her mother! Jen began to panic, wondering if she had hurt her mother, when Jen heard her mother sigh. She saw her mother crawl forward off Jen's cock and pull herself up, and in the most nonchalant tone said, "Jen, I've told you many times not to let Iris get all roused up like that. You need to let him out more. Now I have to go clean all this up." She pointed behind Jen, "And that's coming out of your allowance." Jen's eyes followed her finger to the the dining table and chairs that now lay crushed in pieces amongst the coils of her serpentine tail. Jen blushed, not knowing what she had been doing with her tail during the whole thing.
With that, Jen's mother walked off, leaving a confused and bewildered Jen wondering what the hell just happened.