"So I’ve got a fun idea that might help pass the time." My sister spoke quietly. I turned my attention away from the highway in front of me and directed my gaze to her. I almost swerved off the road when I saw her gorgeous massive tits hanging out, and a finger over her lips, quietly shushing me.
My grip on the steering wheel tightened as I looked back at the road. I glanced back to my rear view mirror. I looked back at the sleeping man in the back seat, relieved that he hadn’t woken up. “Jesus, Holly.” I whispered “You want to do this now? Your husband is in the back seat.” She just smiled, and nodded. She pinched and twisted her nipple between her fingers, giving a sexy moan as she did. It was all the convincing I needed. “Ok, but try and be quick.”
She giggled “Best little brother ever.” She reached across and fumbled with the zipper of my jeans, pulling it down and reaching her hand inside. She stroked me, kissing my neck as I grew firm in her hand. I shifted in my seat so she could get my cock out, and she wasted no time releasing me and sinking her head down in my lap. I tried my best to stay focused on the road as my sister gave me a phenomenal suck job. Her lips wrapped around my shaft, sucking me as deep as she could while I was sitting in the driver seat.
I put one hand on the back of her head, running my fingers through her hair. keeping the other hand on the wheel. I guided her pace on my cock as she eagerly blew me, her drool running down my balls. I couldn’t help look down, trying to get a glimpse of my cock in her mouth. I may have looked too long, as when my eyes came back up, I saw I was a split second away from driving into another car. I grabbed the wheel with both hands, swerving to the left hard, tossing my sister around a bit. She sat up, making sure everything was ok when we heard rustling in the back seat.
"What the fuck just happened?" My brother in law spat. Checking the mirror, I could see his tired eyes looking around the car. I looked at my sister, she was sitting up in her seat, eyes looking down at my cock, which was still sticking proudly out of my jeans.
"It was nothing, babe. Someone almost cut us off." Her lie sounded convincing enough, even though she was still eyeballing my cock, licking her lips.
"Yeah, right. I knew we shouldn’t have let the kid drive." I made eye contact with him in the mirror, scowling at him. I was feeling far less guilty about letting his wife suck my cock.
"Babe, don’t. Just close your eyes and go back to sleep." He grumbled, then leaned back and closed his eyes. Within only a few minutes, he was snoring again. My sister leaned across the seat, whispering in my ear. "He’s asleep, are you still hard for your big sister?"
The answer was obvious, so she didn’t wait for an answer before she brought her lips back down around my shaft. I could feel her amazing breasts pressing into my leg as she bobbed up and down. Checking the mirror again, looking at my sleeping dope of a brother-in-law as his wife serviced my cock. The same way she has since we were kids. I got a contented smile on my face. “He’s an idiot you know.”
She lifted her mouth off my cock. “Yeah, I know. That’s why I blow you, not him. Now shut up and cum in my mouth.” My cock twitched as her mouth slobbered over me again.
"Fuck, here it comes." She sucked harder as my cock pumped into her mouth. My legs stiffened as my balls emptied themselves between her cheeks. She sucked hard, moaning in pleasure around me as my semen flooded her mouth. She gulped it down until I was empty. She lifted her head off my dick "That was really good." She tucked my cock back in my jeans, and zipped me up. "Thank you. I missed you a lot, you know" She leaned over and gave me a wet kiss on my cheek.
"I missed you a lot too. You need to come back soon. The last time we had sex was after your wedding." She giggled, and wrapped her arm around mine, nuzzling her head on my shoulder.