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Disclaimer: All characters over the age of 18. I hope you enjoy.
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It was the end of my freshman year of college, and my mom had driven the 100 miles up to college to pick me up. Most of my dorm belongings were in a storage locker near campus, so it didn't take long to pack the car, to begin making the return trip home for the summer. Since she'd driven up, I volunteered to drive back. I didn't need a car on campus, but had my license so I could drive when I needed to, especially when I was home for the summer.
As we got onto the interstate, I brought her up to date on my classes, how my finals went, and what my final grades were. I was winding up with a 3.8 GPA for the semester, an improvement on the 3.6 I'd managed the first semester.
"I'm so proud of you, Davey!" she said, reaching over to rough up my hair. Only Mom still calls me "Davey", I'm Dave to everyone else. When she said it felt sweet, not childish. I tried to straighten my hair with my fingers. "So, have you been having any luck on the girlfriend front since you broke up with Sarah? You haven't mentioned any dates during your last few calls home. Or can I assume your improved grades are from studying instead of fucking any girl you can?"
"Mom!" I gasped, looking over at her. I had never heard her use that language in my entire life. I couldn't imagine her even thinking about me having sex. She'd found a pack of condoms in my room at Thanksgiving, so I know she was aware I was having sex, but this? I swallowed hard, before answering, "A few dates here and there, mom, nobody special, and nobody I wanted to take to bed. Guys can get reputations, too, that'll scare away the kind of woman I want." I didn't want to say that none of the girls seemed to stack up to my mom in looks or personality. She was the most beautiful woman I know, 5'6", always trying to drop below 145 pounds. I knew her bras were 37Ds, and guessed her waist and hips as 29 and 40 inches. Classic hourglass. She was always complaining that her excess weight was on her hips. I thought they looked beautiful just the way they were, because it gave her a great ass. If any woman was a MILF in my neighborhood, it was her. I tried to ignore the stiffening that was happening between my legs.
I looked over at her again, and saw her crying. "Mom, what's going on with you? Are you okay?"
She sniffed, wiped her tears away, and whispered, almost drowned out by the road noise, "I wish I could say your Dad wasn't fucking anything he could.." She took a deep breath. "I know he's having an affair. He denies it, but I know it's true. You don't come home and taste strange pussy on your husband's dick and not know it. I don't know who she is, but it's happened three times in the last week that I've come home and wanted to have sex with him."
Mom never talked to me about her love life with me like this. It just wasn't like her. I felt my dick stiffen further, just imagining her going down on Dad, and shocked myself by imagining her going down on me. "Do you want me to kick his ass for you, Mom? Nobody should get to treat you like that."
"My defender? No, I don't think that's going to help, at all. I finally confronted him about it after the second time, and he denied it, and after it happened the third time, he told me I was crazy, and wouldn't let me make love to him, and he slept in your room for the night. That was yesterday. I just don't know what to do."
I reached my right hand over to where hers was on the armrest between the seats, and squeezed. "Do you think the two of you are headed for divorce?"
"I don't know," she sighed. "I love your father, and I want our marriage to work, but it can't if he's lying to me. It might be different if he'd just admit to it, and we could work on whatever caused him to stray."
"I'm so sorry, Mom." I gave her hand another squeeze before returning it to the steering wheel. "Whatever you decide, Mom, know that I'm in your corner. And ready to kick his ass if you change your mind." I had three inches and about 30 pounds on my Dad, and was pretty sure I could do some damage if needed. While hoping like hell it wasn't.
We rode in silence for quite a while, when I heard my mom's cell phone, which we were using for GPS navigation, give out a battery warning. It was plugged into the charger in the dash, but clearly wasn't getting any power. Must have been a short. We tried mine, but it was already low, and we still had 40 miles left to go. We didn't have a way to let Dad know of our arrival, but decided to just finish the drive, rather than get off the highway and try to find a payphone.
Arriving at the house, we saw Dad's car in the driveway, but not my sister Amy's. Amy was a Senior in high school, due to graduate in a few more weeks. I parked the car in the driveway, and Mom and I each grabbed a box and headed to the door. We were still in thoughtful mode, so weren't making a lot of noise, and opened the door quietly.
And immediately heard the sounds of fucking coming from one of the bedrooms. Mom froze and whispered, "Son of a bitch. He's actually doing it here. Since our cell phones are dead, find the digital camera in the kitchen drawer - I'm going to catch him in the act. Let's see his divorce lawyer wiggle him out of that one."
I quietly got the camera, turned it on to make sure it had working batteries, and brought it to Mom. Whoever Dad was fucking, it sounded like he was really slamming into her, and she was loving it, and I was getting hard really quick. I know, it was my Dad, but I hadn't gotten any in a while, and pretty much anything was getting me hard.
Mom and I crept down the hallway, and saw that the bedroom door was open. The sounds were definitely coming from it. As we came to it, Mom raised the camera. Then she froze again. I heard her grunt, like someone had gut punched her. And as I came up behind her, I realized that was accurate. There, on the bed, was my Dad, really pounding the shit out of my sister Amy, and she was giving as good as she got. She orgasmed right at the moment we saw them, and the sounds of her moans finished filling my cock. Damn, the sight was hot!
I think Mom and I were in such shock, that we couldn't say anything, and the two lovers hadn't noticed us. My mom lowered the camera, and staggered, falling back into me. Right into my rock-hard dick. There was no way she couldn't notice it, and she did. She put her hands back on my hips to steady herself, and then I felt her rotate her ass into my groin, and then put her hand between us, and ran her hand along its length. Without saying a word, she turned, looked me straight in the eyes, and mouthed, "Follow me." She took my hand, and walked me to my bedroom down and on the other side of the hall, and closed the door behind us.
I hugged her and when I could think clearly, I asked, "Mom, why aren't you screaming at Dad right now? That's my sister in there!" Amy was a slightly smaller clone of my mom, an inch shorter, and maybe 20 pounds thinner, she hadn't gained the hips my Mom had, but was still a sexy little minx. And clearly knew how to fuck.
She pulled her face back a few inches to look me in the eye. The lack of tears surprised me. "I ought to be, Davey. But what your Dad and Amy have done, has finally given me permission to do this." And my mother kissed me. Hard. Oh-my-gawd-I'm-going-to-cum-hard. "If he gets to have your sister, I get to have you. Fuck me Davey. I want you to so much."
