Suggested by: @KazJackson0 Thank you for the suggestion!
Sam and Dean had to arrive in St. Louis in the next few hours. Sam wanted to stay with Dean in the motel they were staying in, but Dean wouldn't have it, they had to do their job.
Sam unbuckled his seat belt and scooted closer to Dean, who was driving. He tried to kiss his older brother's lips, but Dean wouldn't let him.
"Sammy? What are you doing?" he asked, slightly irritated.
"I want you" Sam replied simply.
Dean rolled his eyes, "Well, any other time, I'd be fine with that, but I can't kiss you and drive at the same time."
Sam shrugged and moved to Dean's neck. He began kissing, biting and sucking, creating a few small marks on Dean's soft skin. His hands held tightly onto Dean's hips. Dean struggled to keep his eyes open and concentration on the road.
"S--Sammy" Dean attempted to say, but it came out as a slight moan. He could feel his jeans tighten.
At that point, Sam unlatched himself from Dean's neck, finally allowing him to take a breath and concentrate on driving, but not for long, as he then began to kiss the skin right above his brother's waist band. Dean gasped, his knuckles began to turn white because of his grip on the steering wheel. Sam unbuttoned and unzipped Dean's jeans.
"Lift that cute ass of yours." Sam demanded, voice filled with seduction. Without thinking, Dean lifted off the seat and Sam pulled down his jeans, along with his boxers. The Impala sped up slightly as Dean accidentally pressed down harder on the accelerator. Sam teased Dean by kissing the skin of his inner thighs, making Dean become harder. It took everything Dean had to hold back his moans, face forward and not take his hands off the steering wheel.
Finally, Sam took Dean into his mouth. Dean couldn't hold back anymore as his neck tilted slightly upwards, his eyes shut tightly, and a string of loud moans (along with some curses) released from his lips. His hips moved in time with Sam's mouth. The Impala swerved back and forth as Sam continued, taking more of Dean into his warm mouth. Quickly, Dean looked to the road again, gaining control of the swerving Impala. Sam didn't stop. Dean allowed one of his hands to entangle in Sam's hair. It was still too much for him, he couldn't concentrate on driving when he wanted to give Sam every ounce of attention he deserved.
"Sammy..." Dean said, pulling on his hair to get him to pay attention.
"Hmm?" Sam replied, making Dean gasp at the vibrations he created.
"Y... you need to stop." Dean managed to get out. Sam's head lifted to meet Dean's eyes. Dean whimpered slightly from the loss of Sam's mouth.
"What's wrong?" Sam asked.
"I can't drive when you're doing that." Dean snickered. "and don't even ask me to pull over, because then we won't make it to St. Louis in time."
Sam sighed exasperatedly, "How much longer do we have?"
Dean checked the time, "about an hour to an hour and a half"
"Ugh" Sam reached down to pull up Dean's pants for him. He zipped and buttoned them before leaning back into the seat.
"I know baby. You can blow me all you want when we get to our motel" Dean said with a wink. Sam slapped his arm. Both Winchesters ended up laughing and playfully hitting each other.
"Hey! At least you don't have to deal with this." Dean suddenly said, gesturing to his clearly visible erection.
Sam smiled and leaned into Dean's body. Dean wrapped an arm around Sam, keeping the other hand on the steering wheel. He quickly kissed Sam's hair. Sam wrapped an arm around Dean's waist and closing his eyes, hoping to sleep the next hour away.
