Her eyes widen and she blushes deeply. "I... I just wanted to apologize for what happened earlier," she whispers, her voice barely audible. "It was inappropriate and wrong, and I shouldn't have done it."

But even as she says this, you can see the desire in her eyes, the need for more of your cock. She slips off her panties and spreads her legs invitingly, offering herself to you through the hole. "Will you... Will you fuck me again?"

Her mouth water at the sight of your hard cock poking through the hole. She wraps her warm, soft lips around it, sucking eagerly as she begins to stroke herself in time with your thrusts. Your sister moans loudly, lost in the pleasure of having your dick in her mouth and hand.

As she continues to suck you off through the wall, she positions herself so that you can feel her wetness against the head of your cock.