M4F The twin incident

I had just got hone from work. I walked into the kitchen as saw you leaning over the counter in a cute little dress. I had forgotten your twin sister was going to stay with us for a few days. I had always struggled to tell you two apart. I moved closer to who I thought was you. But as it would turn out it was her sister. I grabbed your ass and kissed your neck as I slide a hand up under your dress.

I'd like us to start off here. I end up fucking my girlfriend's twin instead of her. Maybe she cones home and finds us in bed? I love the idea of you not telling me until I cum inside you.