Caught - part 1.

You open the door expecting your girl. Instead her younger sister stands there, flushed and uncertain, in nothing but a towel. The fabric slips lower with every breath she takes. She steps closer, eyes bright with want, asking for touch without saying it out loud. Your hand finds her waist, smooth and warm. She leans in, lips parting. A single kiss turns into another, deeper, until she drops the towel completely. She goes to her knees, takes you in her mouth, working you slowly at first, then with more hunger. You lift her onto the bed. She turns, offering her ass, and you slide into her there, careful, then harder, her quiet cries urging you on. Every thrust risks the sound of a key in the lock. You keep going anyway.