Mother Toriel led her son Ariel into his bed chambers at bedtime.  Another day has passed and both she and her child were tired.  She would wait at the door frame as he undressed, tossing his garments into the hamper as he became completely nude.  A smiling Toriel then noted her son's penis, dangling free as he was scampering to get his pajamas.  Her smile then turned into a smug smirk, gently closing her son's bedroom door behind and neared him.  Before Asriel would get to his sleeping garments she placed a hand on his naked shoulder.  Asriel, confused at the abrupt notion turned up to see his mother's face, whose eyes were blocked by the glint of her eyeglasses and a wide smile on her lips.
"M-mom...?"
"Shhh, it’s alright my child, just sit on the bed as you are." 
Not questioning her strange request Asriel would just do so, sitting with arms over his body covering himself as he watched his mother.  His eyes would grow bigger as he witnessed her undressing before his eyes, each of her discarded garments revealing her voluptuous form which would make him wonder how it all fit within her robes.  By the time she took off her panties, the young demon child covered his genitals; feeling embarrassed and closed his eyes, a rose tint appearing on his white-furred cheeks.  Toriel setting her eyeglasses aside as the last item to discard neared him, still with a smile admiring her cute boy's innocence and morality.  She came close to him and kneeled, all while comforting him with a kiss on his cheek.  Asriel opened his eyes at the sight of her enormous breasts and while he felt like his face was crimson at this point, he still said nothing.  Toriel then would guide her hand over his, setting them away to reveal his small shaft fully erect and throbbing non-stop.
"Oh my, all this for me...such a thoughtful child."  She giggled as she then went down on a startled Asriel.  For a while now the young prince has spotted his mother in the nude, at times when she would go and take her daily hot bath or whenever she would wake in the morning, not realizing her son's wide eyes would scan her grand body.  He never would have suspected he would experience this close much less touch him in a way that was more than a maternal hug and comfort.  
Asriel then tossed his head up and gasped at the feeling of his mother's wet, thick tongue salivating all around his member.  He would not know what to do at this point.  This was too much.  He placed a tiny hand over her shoulder as she began working on him, said tongue wrapped on his cock and sucking gently.
"Hnnmmm....mmmmom..."
Toriel hummed, trying to calm the young boy down as she continued servicing his little pole, which would feel great in her mouth as she felt the vibrations of it throbbing.  She wanted to suck him off hard and fast, but knew this would be the first time her loving son would experience a female tending to him this way.  In all years of experience with males before she met her father she readily knew how to treat a first timer in such way.  In fact, Toriel wanted to take things even slower than this, but her son's penis was too good to ignore and would simply dominate him without caring much on following any form of rules about it.  He was her son and would do anything to make him happy.
Asriel's moans and pants made Toriel wet.  The young prince holding around her head as his member felt being suctioned by her expert mouth.  Sweat began coming down his furred face and body, his breathing accumulating and increasing as she kept on pleasuring him.  Soon enough he opened his eyes anew and came into her mouth, yelping a bit as he felt his tiny cock squirting for a few seconds.  Asriel would blush more at the realization that he just might peed in her own mother's mouth, but then winced as Toriel sucked on him a bit more, getting the rest from his tiny ballsack.  Toriel would rise up stretching and moaning as she gulped it all down, all the while Asriel falling on his back panting in bed.  Toriel placed a hand on her mouth, giggling at seeing her son getting all flushed.
"Did my child enjoy his mommy's game?"
Asriel would nod, even when it was a weird experience he would not deny enjoying the entire scene.  He would see her getting in bed with him, her big arms cuddling his naked body next to hers and his head resting on her huge breast pillows.  Toriel would then caress his head gently, humming a lullaby closing her eyes.  Asriel soon closed his already forgetting about what just transpire and slept holding his big mother close.  As both slept through the night, their dreams filled with consuming their closeness as they did just tonight, which brought a smile on their lips.