I had just turned nineteen when it happened. Mom had been acting different for weeks, wearing those short silk robes around the house that barely covered her ass, brushing against me in the kitchen like it was an accident. That night Dad was out of town again. We were alone. She poured us both a glass of wine even though she knew I was underage for it, but fuck if I cared. We sat on the couch watching some dumb movie and her hand landed on my thigh, higher than it should have been.
"You've grown up so much," she said, voice low. Her fingers squeezed. "Been thinking about you a lot lately."
My cock was already hard in my jeans. I didn't say anything at first, just let her hand slide up until she was rubbing the bulge. She smiled when she felt it.
"Take it out for me," she whispered.
I unzipped and pulled my dick free.

Mom wrapped her hand around it right away, stroking slow and tight. "Fuck, Mom," I groaned. She leaned over and licked the head, then took me deep into her mouth without any teasing. Her lips slid down to the base and she sucked hard, bobbing her head while her hand worked the shaft. I grabbed her hair and fucked her throat a little, the wet sounds filling the room.
She pulled off, spit dripping down her chin. "I want you inside me. Now."
We didn't even make it to the bedroom. She stood up, dropped her robe, and bent over the arm of the couch. Her ass was perfect, round and soft, and her pussy was already wet and shaved smooth. I got behind her and rubbed my cock along her slit a few times before pushing in. She was tight and hot, gripping me all the way as I sank balls deep on the first thrust.
"Oh god, yes," she moaned. "Fuck your mother."
I started pounding her right there, gripping her hips and slamming into her. The couch creaked under us. Every time I bottomed out she pushed back, taking it deeper. I reached around and rubbed her clit while I fucked her, and she came hard, her pussy pulsing around my cock, juices running down her thighs.
We switched positions fast. She pushed me onto my back on the floor and climbed on top. She sank down on my dick again, riding me in long, grinding strokes. Her tits bounced in my face and I sucked on her nipples, biting them lightly while she ground her clit against me. "That's it, baby," she panted. "Fill Mommy up."
I flipped her onto her back, hooked her legs over my shoulders, and drove into her hard. The slap of skin on skin was loud. She was begging, dirty words pouring out of her mouth. "Fuck me, fuck your mom, make me your slut." I couldn't hold back anymore. I buried myself deep and came, pumping thick loads into her while she came again, clenching around me.
We stayed like that for a minute, breathing hard, my cock still twitching inside her. Then she pulled me down for a slow kiss and whispered, "Round two in the shower?"
We didn't sleep much that night. By morning we had fucked in three more positions, and Mom was already talking about what we'd do when Dad left town again. It was the start of something we both knew we shouldn't want but couldn't stop.