My stepmother invited me to go to the sauna.

I always thought our family was a typical mix of old grudges and new habits, especially after my father married Helen. She was in her late thirties, with those curvaceous figures she didn't hesitate to accentuate with tight dresses, and eyes that I sometimes caught looking at myself when she thought I wasn't paying attention. I, a twenty-two-year-old guy, had just graduated from college, returned home for the summer, and there we were, all in the country house—my father, my mother, and I. Vacation, supposedly. My father would disappear all day fishing or into the garage with the car, leaving the two of us to hang around the house, and Helen would flirt with me so subtly that I couldn't believe it—she'd brush my hip as she passed, or smile out of the corner of her mouth when I helped with the dishes. That evening, after dinner, when my father was already snoring in front of the TV in the living room, she approached me in the kitchen. "Listen, Alex," she said quietly, her voice like warm steam, "the house has heated up during the day, and the sauna in the basement is empty. Do you want to go for a steam bath? My father won't get up anyway, and I'm bored alone." I froze, plate in hand. Sauna? Alone? The thought of her in a towel, beads of sweat on her skin, hit me like a sip of whiskey. "Um, okay, why not," I muttered, trying to sound indifferent, but my heart was already pounding. She nodded, her lips curling into that same smile, and went to change. The sauna was small, wooden, with a stove that hissed when Helen splashed water on it. I went in first, wrapped in a towel, and sat on the top shelf, feeling the heat envelop my body. She followed, wearing a white towel that barely covered her full hips and breasts—heavy, with dark nipples that showed through the fabric as she sat opposite me. "God, it's so hot," she sighed, throwing her head back and her legs parted slightly, revealing the smooth skin of her inner thighs. We chatted about nothing in particular—the weather, our plans for tomorrow—but the air grew thick, the steam billowed, and I could feel my cock hardening under the towel as I watched her. Helen noticed, of course—her eyes slid down, and she chuckled. "Are you okay, honey? You look a little cramped in there." I blushed, but the heat masked it. "Sorry, it's... well, it's a sauna." She laughed softly, moved closer, her knee touching mine. "Don't apologize. You're a grown man, and I... well, I'm not blind. Your father hasn't looked at me the way you do in a long time." Her words hung in the air, and suddenly everything turned upside down. She stretched, the towel slid a little lower, revealing the areolas of her nipples, and I couldn't resist - I reached out and touched her thigh. "Helen, this... we shouldn't." But she intercepted my hand, pressed it to her skin, hot and damp with sweat. "Who will know? Just relax. I've seen the way you look at me for months. You want me, right?" Her directness hit me like steam from a stove. I nodded, speechless, and she stood up, throwing off the towel completely. Her body was stunning – mature fullness, with a soft belly, wide hips, and a thick triangle of dark hair between her legs, where beads of something other than sweat were already glistening. "Lie on your back," she ordered, her voice hoarse, commanding. I obeyed, the towel fell off, my cock standing erect, hard and pulsating, its veins swollen with heat. She stepped over me, straddling my face, her thighs gripping my head, and I drowned in her scent – musky, salty, mixed with sweat. "Lick me, Alex. Hard, like you hate me but want me." I thrust my tongue into her, feeling her labia part, wet and plump, her clit hard as a pea beneath my tongue. She moaned, pressing harder, her juices running down my face, dripping onto my chin as I sucked and licked, swirling my tongue around her entrance, penetrating inside where she was hot. "Yes, like this, deeper, you son of a bitch," she hissed, squirming on me, her hands in my hair, tugging painfully, but it only turned me on. "Suck my clit, bite it lightly." I obeyed, my teeth grazing the sensitive flesh, and she shuddered, her thighs clenching, squeezing my head until orgasm washed over her - she arched, crying out softly, "Oh God, yes!" and the liquid splashed into my mouth, salty and warm. She climbed down, breathing heavily, but didn't stop, her eyes burning. "Now fuck me, stepson. I want to feel you inside me." I sat up, and she straddled me on the shelf, her breasts swaying against my face, her nipples hard and dark, beaded with sweat. She took my cock in her hand—thick, with the head swollen and red—and guided it into her, lowering herself slowly, moaning until I entered completely, stretching her wet walls. "You're so big," she whispered, starting to move, up and down, her ass slapping against my thighs. "Fuck Mommy hard." I grabbed her hips and thrust upward, slamming into her, feeling her vagina contract around me, pulsing, each thrust accompanied by slurping sounds, her juices flowing over my balls. We shifted positions in the heat—she lay on her back, legs spread wide, and I thrust in again, biting her nipples as she clawed at my back. "Deeper, Alex, tear me apart," she demanded, and I sped up, sweat pouring in streams, mixing with her wetness, until I felt myself welling up. "Cum inside me, baby, fill Mommy up," she breathed, and I exploded, cum gushing inside, hot and thick, as she came again, clenching around me. Afterwards, we lay there, breathing heavily, the steam still billowing. "This will be our secret," she said, kissing my neck. I nodded, feeling a mixture of guilt and arousal—this changed everything. We left the sauna as if nothing had happened, but from then on, every look in our eyes was full of promise.