Chapter 4: Crossing the Line

The airport drop-off felt like stepping off a cliff. Mark kissed me goodbye at the curb, suitcase rolling behind him, his usual quick peck on the cheek. “Ten days, babe. Call you when I land.” I smiled the perfect wife smile, waved as he disappeared through the sliding doors, but my mind was already in the back seat where Alex waited. My nineteen-year-old son. The one whose cum I’d worn inside me to the grocery store just days ago. The one whose name I’d moaned into my pillow while Mark was on speakerphone.

I slid behind the wheel. The black lace panties he loved hugged me tight, the delicate fabric already damp from the drive over. Tension filled the car like smoke—thick, choking, electric. Neither of us spoke. Every red light felt endless. His hand rested on his thigh, knuckles white. I could feel his eyes tracing the curve of my breasts under my thin blouse, the way my nipples had peaked the second Mark turned away. By the time we pulled into the driveway my pulse was hammering between my legs.

The house was ours. Ten full days. No more whispered risks, no more stolen moments. The front door clicked shut and the silence roared.

Alex met me in the hallway, nervous energy rolling off him in waves. He held out a small Amazon box, the kind that arrives in plain brown packaging. “I ordered these with my own money,” he said, voice low and rough. “No one else gets to see Mommy like this. Ever.”

Inside were three perfect sets: a tiny red thong that would vanish between my cheeks, a black G-string so sheer it was almost nothing, and a delicate lace babydoll in midnight blue that would barely contain my heavy breasts. My throat tightened with something dangerously close to love.

I took his hand and led him upstairs to the master bedroom. He sat on the edge of the bed—our marital bed—while I stripped slowly. First the red thong. The thin strip of fabric slipped between my full ass cheeks like a secret, the front cupping my already swollen lips. I turned, bent slightly, letting him see how completely it disappeared. His breath caught.