The Glass Wall

The last downward dog of the class, and I could feel her eyes on me. Not the usual scanning for alignment, but something heavier. Mara, our instructor, had been circling me for the last ten minutes, her bare feet silent on the cedar deck. The lake house studio was all windows, and the late afternoon sun turned the water into a sheet of hammered gold. I held the pose, my arms trembling, and when I finally looked up, she was watching me with a half-smile that made my stomach drop.

"Good," she said, her voice low. "Everyone else can roll up their mats. Lena, stay for a minute."

The other students filed out, their chatter fading down the gravel path. I stayed on my knees, my heart thumping. The room smelled of sweat and eucalyptus. Mara walked over, her own practice top discarded, leaving her in a black sports bra and those impossibly tight leggings. Her hair was piled in a messy knot, dark strands stuck to her neck.

"You're holding tension in your shoulders," she said, her hands landing on my bare skin. Her palms were warm, calloused from gripping the mat. "Let me show you something."

Her fingers dug into the muscle at the base of my neck, and I let out a breath I didn't know I was holding. She was so close I could smell her—sunscreen, salt, and something else, something clean and sharp.

"Mara," I started, but my voice came out rough.

"Shh." She knelt behind me, her thighs pressing against my hips. "Just breathe."

Her hands slid down my arms, tracing the lines of my triceps. Then lower, skimming my ribs, coming to rest on my waist. Her thumbs hooked under the hem of my tank top, and the touch sent a jolt straight through me.

"What are you doing?" I whispered.

"Teaching you," she said, her mouth at my ear. "A private lesson."

Her hand moved down, over my stomach, and I was suddenly aware of how thin the fabric of my leggings was. I could feel the heat of her palm through it, and I was already wet. I arched my back without thinking, pushing into her hand.

"Fuck," I breathed.

She laughed, a low, husky sound. "There it is. I've been watching you all month, Lena. The way you move. The way you look at me."

Her fingers hooked into the waistband of my leggings and pulled them down just an inch, exposing the top of my ass. The cool air hit my skin, and then her hand was on me, cupping me through the damp cotton of my thong.

"I want to fuck you right here," she said, her voice matter-of-fact. "On my mat, in front of the glass. Anyone could see us."

The thought made my cunt clench. The lake was quiet at this hour, but the dock was visible, and the occasional boat drifted by. The idea of being seen, of being caught—

"Please," I said, and it came out desperate.

She didn't need more. She pulled my leggings and thong down in one motion, and I kicked them off. Her hand was on my bare ass, squeezing, and then two fingers slid between my legs, parting my folds and finding my clit already swollen and slick.

"You're soaked," she murmured, her fingers circling. "All that yoga, all that stretching... you're so fucking tight, though. I can tell."

She pushed a finger inside me, and I gasped. It was slow, deliberate, curling against my front wall. I gripped the edge of her yoga mat, the rubber digging into my palms.

"More," I begged.

"Patience." She added a second finger, stretching me, and I heard myself moan. The sound echoed off the glass walls. She pumped them into me, her thumb pressing on my clit, and I was already close, the pleasure building like a wave.

"Not yet," she said, pulling her hand away. I whimpered at the loss, but she was already standing, stripping off her leggings. She wasn't wearing anything underneath. Her pussy was shaved clean, glistening with her own wetness.

"Get on your hands and knees," she ordered. "Facing the window."

I obeyed, my heart racing. The lake was right there, the water lapping at the dock. I could see my own reflection in the glass—flushed cheeks, parted lips, the curve of my ass raised in the air. Mara knelt behind me, and I felt the head of her cock—she had a strap-on, I realized, a sleek black dildo that she must have had hidden in her bag—pressing against my entrance.

"Look at yourself," she whispered. "Look how beautiful you are like this."

She pushed in, and I cried out. She was thick, filling me completely, and she went slow, inch by agonizing inch, until her hips were flush against my ass. Then she pulled out almost all the way and slammed back in.

"Yes," I gasped. "Fuck, yes."

She set a rhythm, hard and fast, her fingers digging into my hips. The glass vibrated with every thrust, and I could see her in the reflection—her jaw set, her tits bouncing under the sports bra, her eyes fixed on where we were joined. It was the most obscene, beautiful thing I'd ever seen.

"You like being watched?" she grunted, slapping my ass. The sting sent a jolt of pleasure through me.

"Yes," I moaned. "God, yes."

She pulled out and spun me around, pushing me onto my back. Her body covered mine, her weight pressing me into the mat. She lifted my legs, hooking them over her shoulders, and drove into me again. The new angle made me see stars, her cock hitting that spot deep inside me that made my toes curl.

"Look at me," she said, her forehead against mine. "I want to see your face when you come."

Her fingers found my clit again, rubbing in tight circles as she fucked me. I was on the edge, teetering, and then she bit my lower lip, hard, and I shattered. My orgasm ripped through me, my back arching off the mat, my cunt clenching around her. She kept thrusting, riding me through it, and then she pulled out and came on my stomach, hot ropes of cum landing on my skin.

For a moment, there was only the sound of our breathing. The sun had dropped lower, painting the room in amber. Mara collapsed beside me, her hand finding mine.

"That was..." I started.

"Just the warm-up," she said, grinning. "There's a bedroom upstairs. And a balcony."

I looked at the glass wall, at the lake, at the last light of the day. "What about the neighbors?"

She laughed, pulling me to my feet. "Let them watch."