You don't have to stop

Finally, I break the agonizing silence. I sat up, getting my face away from her exposed pussy and brought myself closer to eye level. However, her legs were still spread as I was sitting between them. "Alice," I whispered. "You were awake the whole time?"

She shook her head. "I was asleep at first," she explained. "but I woke up when you were sucking on my breasts."

"Ah, fuck," was all I had to say. That long! I was caught red-handed. If only I had been more careful! This might destroy our relationship as sisters, and her faith in me as a person. Heck, she might even bring up criminal charges. My mind raced.

"But umm," Alice intervened, "... You don't have to stop."

My mind was blown; I could barely comprehend what she was saying.

Alice continued. "You know... You are really good at what you were doing. And I was actually close to cumming."

Still couldn't believe it. I still was unable to reply. Then I saw her move. She laid her head back down, and said, "here, does this make it easier?" And she took her flexible legs in hand and bent them towards her head, further exposing herself to me. Now, in addition to seeing her glistening pussy in all its glory, I got a great view of her tight asshole too.

"Alice," I managed to speak finally. "Are you sure?"

She nodded. "No one's ever touched me like that." She smiled. "I should have known that you were the person who knew me best. Of course only you'd be able to make me feel like that." With her legs still in the air she added, "How hurry up and finish me off. I want to repay you for everything you did to me tonight."

Without thinking about it any further, I go down and bury my face in her warmth.