The bedroom door stood ajar just enough for a clear line of sight from the darkened hallway. David stood there motionless, one hand braced on the wall, the other already working the zipper of his pants. On the king-sized bed his wife, Elena, lay back with her legs spread wide, her full breasts rising and falling with each quick breath. Between those thighs knelt their son, Marcus, twenty-five and built like he spent every morning at the gym. Marcuss cock, thick and already glistening at the tip, hovered an inch from Elenas shaved pussy.
Davids view was perfect, like a private film playing just for him. He could see every detail: the way Elenas nipples had tightened into dark peaks, the faint tremble in her inner thighs, the slow drip of her arousal sliding down toward the sheets. Marcus leaned forward and dragged the head of his cock up and down her slit, coating himself in her wetness. Elena moaned, low and throaty, and reached down to spread herself open with two fingers.
Put it in, baby, she whispered. Let your father see how deep you go.
Marcus pushed forward. The thick head stretched her entrance, then sank inside in one steady thrust. Elenas back arched.

Davids hand tightened around his own cock, stroking in time with the slow, deliberate rhythm Marcus set. Each time Marcus withdrew, David saw the glistening shaft, shiny with Elenas juices, before it disappeared again into her body. The wet, rhythmic sound of skin meeting skin filled the room.
Marcus gripped Elenas hips and picked up the pace. Her breasts bounced with every impact. David watched the muscles in his sons back flex and release, the way Elenas toes curled against the mattress. He could hear every word.
Fuck, Mom, youre so tight, Marcus growled.
Elena answered with a broken whimper, her hands clutching the sheets. Harder. Show him how you fuck me.
Marcus obliged, driving into her with sharp, powerful strokes that made the headboard knock against the wall. Davids breathing grew ragged. He matched the tempo, fist sliding faster, eyes locked on the place where his sons cock disappeared inside his wife again and again. Elenas moans rose in pitch. Her legs wrapped around Marcuss waist, heels digging into his ass to pull him deeper.
David could see everything: the way Elenas pussy clung to Marcuss shaft on every withdrawal, the shine of her cream along the length, the way her clit stood swollen and needy. Marcus reached down and rubbed it with his thumb in tight circles while he kept thrusting. Elenas entire body shook. She came hard, crying out, her walls visibly pulsing around her sons cock.
Marcus didnt stop. He flipped her onto her hands and knees, facing the doorway. Elenas eyes, glassy with pleasure, looked straight toward the gap where David stood. She smiled, small and knowing, then dropped her chest to the mattress so her ass lifted higher. Marcus knelt behind her and slammed back inside. The new angle let David see even more clearly, the way her lips stretched around the thick shaft, the way her ass rippled with each impact.
Marcuss hands gripped her hips hard enough to leave faint marks. He fucked her with long, punishing strokes, sweat sliding down his chest. Elena reached back and spread her cheeks wider for him, giving David an unobstructed view of her sons cock pounding into her. The wet sounds grew louder, messier. Davids own orgasm built tight and hot at the base of his spine. He stroked faster, matching every thrust.
Elena came again, her voice breaking into a sob of pleasure. Marcus followed seconds later, burying himself to the hilt and groaning as he emptied inside her. David watched the base of his sons cock pulse, watched the thick white cum begin to leak out around the shaft and drip down Elenas thighs. The sight pushed him over the edge. He came in heavy spurts against the hallway wall, biting his lip to stay silent.
Marcus stayed buried inside Elena for a long moment, both of them breathing hard. Then he slowly withdrew. A thick strand of cum stretched between his cock and her well-fucked pussy before it broke. Elena rolled onto her back, legs still spread, and looked toward the doorway again.
David stepped back into the shadows, heart pounding, already knowing he would return the next night. The image of his sons cock sliding into his wife, of her body accepting every inch while she watched him watch, burned behind his eyes. He tucked himself away and slipped down the hall, the sound of their quiet laughter following him like an invitation.