Emma smiled up at Mark, her body still tingling from the intense orgasm. She could feel his cock hardening again inside her, twitching with fresh need. The guilt in his eyes only made her want him more. She squeezed her pussy around him gently, teasing him."Round two already?" she whispered, her voice low and full of desire. "You still want more of your wife's little sister, don't you?"Mark groaned, his hands gripping her hips tighter. His face showed the battle inside him — guilt, lust, and years of frustration. "Fuck, Emma... this is so wrong. She's your sister and this is her bed. But I can't stop. You feel too damn good.""Then don't stop," Emma said, pulling him down for a deep, hungry kiss. Their tongues tangled as she started moving her hips beneath him, urging him to thrust. "Tell me how much better I feel than her. Tell me every dirty thought you've had about me."Mark thrust into her slowly at first, savoring the tight heat. His voice was rough with emotion. "You're tigh
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