She woke up

I have kissed my wife's sister while she slept a few times.

Once she woke up because I had gotten brazen and managed to slip my tongue into her mouth. We never talked about it... I acted like I was trying to wake her up and planned to play it off like maybe she had dreamed it or something, but she never said anything... we just talked. It was so awkward. I knew she knew. Nothing came of it... good or bad.

I wish I would have had the nerve to ask her what she thought about it.

I kissed her sister

We fell asleep next to each other on the living room couch watching television. When I woke up, somehow, my arm was around her and her head was leaning on my shoulder. Before I knew it, still half asleep, I leaned over and kissed her lips. She started to kiss back and then a few seconds into it, she woke up. It was awkward and we have never talked about it... it was such an amazing moment. I wish I could kiss her again.