John had had an intimate relationship with Dean since the boy turned ten. They shared wet kisses, John's tongue thrusting into the boy's mouth. Their hands on each other dicks. Mouths hot around hard flesh. John didn't fuck Dean for fear that he'd gravely hurt him, but sometimes John fucked his son with his thick fingers. The boy writhing and gasping under him from the stimulation to his prostate.
It changed when Dean turned twelve. John had known of Dean's feelings for his brother even when they had first started. He had no objections to Dean acting on his feelings for Sam, but he had thought that Sam was a bit young to be introduced to the longings of his elder brother. He had wanted to wait for another year or two, but the day before Dean's birthday came, and Dean could barely look away from Sam.
That night, when Sam had been tucked into bed, John had three fingers thrusting into Dean's body while he used his other hand to stroke the boy's cock. He leaned forward to whisper right into his son's ear. "I know you want Sam. You can fuck him you know. Imagine how it would feel not to have my mouth or our hands wrapped around your cock, but his tight little hole. Imagine how he'll moan under you." With that Dean came all over John's hand. John licked his son's come from his fingers than spoke once more, "You can fuck him tomorrow. On your birthday.
That night Dean got barely any sleep. All he could think about was his Sammy. He had a hard time not doing anything to Sam the whole day. All he wanted to do was stop his little brother's mouth with kisses, bring Sammy the ultimate pleasures.
When night fell once more John told Dean that it was time. They entered the room. John sat on a chair, while Dean crawled onto the bed with his brother.
Dean pressed soft kisses to Sam's face. Sam mumbled a sleepy, "Dean?". Dean kissed his little brother on the mouth.
"Ya, it's me, Sammy." Dean stroked his hands down Sam's thin sides. Sam giggled softly at the touch.
"What are ya doing, De?" Sam asked as Dean's fingers petted at the soft flesh of his stomach.
"I'm loving you, Sammy. Won't you let me love you?" Dean told Sam as he kissed down the column of his throat. Sam nodded his consent. With that Dean moved so that he was over Sam and caught his little brother's lips in a kiss.
When Dean slid his lips against Sam's yearning for entrance, his little brother opened his mouth right up for him. Dean eagerly thrust his tongue inside and tangled it with his brother's.
As Dean kissed his brother he let his fingers roam down so that he could gently tweak Sam's nipples. The action caused his little brother to writhe in pleasure. Dean sat up and pulled off both of their tops.
Then he kissed his way down his brother's chest. When he reached a nipple he sucked on it, pinching the other with his fingers. Sam trembled under him in pleasure, moaning and gripping the sheets tightly with his small hands. He paid the same treatment to the other nipple.
Then Dean removed their pants and boxers. Sam looked at him questioningly. Then Dean wrapped his hand around Sam's small dick, and began to move his hand. All Sam could do was moan at the new pleasure. Dean grabbed the lube that was in the pocket of his jeans and poured some on his fingers.
"This might feel kind of weird, Sammy, but you just need to relax into it." Dean told him, then he gently pushed one lube coated finger inside his baby brother. He thrust his finger in and out. Once Sam's body had grown accustomed to the finger he inserted another alongside it.
Dean kissed Sam softly as an apology for the slight pain. Then he slowly pushed in the third finger. After a few thrusts of his fingers, he rubbed against the little nub of nerves inside and Sam arched his back and moaned in ecstasy.
Dean continued to thrust his fingers in his little brother and he caught Sam's mouth in a deep kiss. He fucked his brother's mouth with his tongue, as he fucked his brother on his fingers.
Dean coated his cock with the lube, then moved so he was lined up. He wrapped Sam's thin legs around him for better access. He slowly entered his brother, he kissed him and stroked his cock, trying to distract Sam from the pain.
Once he was fully inside his brother tight heat, Dean stilled. Waiting for Sam to grow accustomed to him. When the pain ebbed, Dean gently pulled back and thrust into his brother's small form. On the third thrust Dean hit Sam's prostate, and Sam howled in pleasure, clawing at his big brother's back.
They continued to thrust together until Sam came with a cry of Dean's name. The clenching of the heat around him, caused Dean to release deep into his baby brother.
On the other side of the room, John came in his hand with a low groan.