In bed with my stepdaughter

I've been with my girlfriend for five years. Her daughter lives with us every summer. She and I have always gotten along very nicely and I love her very much. Her mother and I have not been getting along. She works nights and ignores both of us. Kelly's 18th birthday was in july and I arranged her friends and family to surprise her and she was. Her mom left for work right after the surprise and I pretty much left her alone with her friends for the night. After the party she came to me and hugged me and thanked me profusely. I had one more surprise left. My friend gave me three bottles of champagne (high end) and I told her I wanted to share a toast with her. I poured two glasses and told her how much I loved her and what a wonderful woman she had become. We clinked glasses and drank. We sat on my bed and talked and finished two bottles. I normally don't drink and laid on the bed. She laid down beside me and we both fell asleep. I woke up to a beautiful young girl kissing me. I was not really clear but suddenly I realized I was in bed with my stepdaughter. She caressed my tongue with hers and I didn't care. We pulled off each others clothes and began to make love. I love hardcore sex but this was as romantic as anything I have experienced before. She ground her pussy on my hard dick and I shot my strong stream of sperm into her tight vagina. She wasn't done and straddled my face with her sweet cunt. I licked and sucked and felt her pussy convulse with her big orgasm and tasted all her juices. She changed positions and kissed me with her taste on my lips. I told her Happy Birthday and she said I love you, daddy!