It was just after 7:00 AM when the door to Dean's bedroom slowly opened. His son, James, peered in, only just able to make out his father's nude figure in the dim sunlight that filtered in through the curtains covering the window next to the large bed. The buff otter was lying prone on top of the covers, having kicked them off in the summer heat. Though he was in his late 30s, he took care of himself, exercising and working out several times a week, and his musculature was visible through his dense fur. James, being only 15 and less physically active, was much smaller than his father. He stood a full foot shorter, and was very thin.

As he stepped into his father's bedroom, wearing the overly large T-shirt and long shorts that he usually slept in, he made sure to tread as silently as he could. Upon reaching the foot of the bed, he dropped his shorts and stepped out of them, his dick already at half-mast in anticipation. It glistened a bit from the lube he had applied just moments prior in the bathroom. As he carefully climbed up onto the bed, going slowly so as not to wake his dad prematurely, his dick dragged over Dean's foot, the webbed toes flexing a bit from the touch.

He gently pushed his dad's tail to one side, taking a moment to admire the toned ass before straddling his hips. Using one hand, he aimed his now hard cock at the fleshy entrance between the older otter's cheeks, pressing into it until it relented and his glans popped past the snug ring of flesh. James stopped for a moment, both to enjoy the sensation of his father's ass surrounding the head of his dick, and to make sure that Dean was still asleep. Satisfied that he hadn't woken his dad, James began thrusting in and out of that tight hole, using shallow thrusts that caused his cock to sink slowly deeper each time.

As soon as he was halfway in, he leaned over his dad's muscular back, his loose shirt draping over it, and started to thrust deeper and more quickly. It wasn't long before he was hilting each time, his thighs making soft smacking sounds as they contacted his father's. Lost in the moment, he sprawled across his dad's back, grinding his length in and out as best he could, arms wrapped around Dean's wide chest. The heat from the older otter's pits on his arms drove him wild. His head swimming, he pounded relentlessly at his father's ass, primal desire overwhelming his young mind.

Dean slowly woke from his dream state, body rocking back and forth as his eyes fluttered open. He felt a familiar fullness in his backside as he noticed the pair of arms holding him tightly around his chest. A gasp and grunt from above him was followed immediately by a hard thrust as his son hilted inside his ass. James' cock throbbed inside the warm passage as his orgasm hit; several hot, sticky ropes of young otter cum painted his dad's anal walls. When James' body went limp, Dean gave him a moment before speaking up.

"Good morning to you, too, son." James just chuckled, too spent to even pretend he was shocked. "Morning, dad. How'd you sleep?" "Well, I slept okay, but I must say that waking up was much more enjoyable. Did your mother put you up to this?" "Yup! Happy Father's Day, dad." Dean turned his head as best he could, James closing the gap for him as their lips met in a passionate kiss. From the doorway, Dean's wife -- an otter even smaller and thinner than James -- stood in only her nightgown, fingers wet on one hand, a handheld video camera in the other. It may be her husband's day, but she saw no reason why she couldn't enjoy it, too.