It came back to me right away.
Merely days after my eighteenth birthday.
I remembered it clearly as we'd gone shopping together; me to spend the gift vouchers I'd accumulated and her to buy a new outfit for a wedding she'd been invited to. We'd gone our separate ways and having been focused on what I'd wanted to buy was done well before her.
"The staff here are awful but they have such nice clothes," she stated when I finally located her in a dress shop and I remember myself grunting.
There was a ridiculously hot sales assistant roaming the floor and I straightened when she passed, trying to hide the video games shop bag I carried.
"Do you have this in a ten?" Mom inquired and the girl looked dismissively, waving a hand at the produce.
"Whatever's on the rack," she looked down her nose and Mom shook her head in bewilderment as the girl walked away.
"Cow," Mom said under her breath as I was mesmerized by the girl's ass in the tightest black wet-look leggings I'd ever seen.
"I think she's kind of nice," I defended the sale assistant and Mom looked at me with just as much angst as she took a dress from the rack followed by two others.
"Come on, I need to try these on," she stated as she headed toward the changing rooms.
"Ok, I'll wait out the front," I replied, thinking it would allow me to see the salesgirl through the store windows discreetly.
"Oh no you don't," Mom tugged at my shirt as I attempted to abscond. "They only allow three items in the rooms; I'll need you to grab the other sizes for me if these don't fit."
"Won't the staff help?" I complained.
Mom just raised her eyebrows in response before crooking her finger in a sign for me to follow.
There was a seat directly outside her cubicle free, which was unfortunate as the two curtains that worked as a screen barely came together on each room. If I'd been sitting outside one of the others, I would've had the amazing possibility of seeing a woman undress. Instead I attempted to distract myself as my mom removed her own clothing not four feet from me.
I delved into my bag and withdrew one of the PS4 games I'd purchased, reading the back label just as the salesgirl in the black leggings arrived to assist one of the other customers.
"Waiting for your mom are you pet?" She smiled as she passed an item through one of the other curtains.
I felt myself blush as I stuffed my game back in the bag, attempting to come up with something witty to say. "I'm helping," I stupidly replied and she again smiled, this time out of habit before she dismissed me outright.
Mom's curtain opened a fraction further and she poked her head through followed by one of the dresses.
"See if this one is in an 8?" She asked as she handed it over. The dress caught on the curtain and it swung wide, Mom's body coming into view. I averted my eyes immediately but not before the damage had been done. She was wearing pantyhose. Flesh toned. I dared not look at her groin but, in the mirror behind, it seemed to me she wore no underwear beneath. Of course, there may have been a thong hidden in the shadow of her ass crack but this too I tried not to even imagine. A cream colored bra pushed her breasts up to form considerable cleavage and with my face already blushing from the altercation with the staff, I only got redder as I attempted to get out of there as quickly as possible, irreparable harm done to my corneas.
*
I stroked my fingers down her arm as we spooned. My cock safe and snug between her upper thighs. I kissed her neck and she turned her face to look at me from the corner of her eye.
"It was the moment I knew," she whispered.
"What do you mean?" I asked squeezing her around the belly to snuggle in tighter against me.
"When I was there. In the changing room, your eyes on my body. I wanted you to look. To see me like that, naked," she confessed.
"Something I've always wondered," I kissed her behind the ear. "Were you wearing panties?"
"No," she sighed and it had my cock again stiffening, Mom immediately putting a hand down to allow it entry. Her fingers pressing my underside and sliding the head between her folds, easing me inside herself.
"Mmmh," she sighed as I slowly thrust my length into her.
"If only I'd known," I sighed.
"About my panties?"
"About everything," I admitted. "For memory I was more interested in the salesgirl."
Mom laughed. "I know, it's ok. I don't blame you. How could you have known?"
I didn't answer and she was silent but for a gentle sighing as I slowly fucked her from behind.
'As I slowly fucked her from behind.' My mother! Even thinking the fact having me on the verge of orgasm. I paused and released my grip around her somewhat and she once again turned her head sensing the change.
"What is it?" She asked.
"Why didn't you tell me?"
Mom allowed my dick to slide out of her and she rolled in my arms, climbing atop me as I lay on my back.
"I did everything but," she admitted.
"What do you mean?"