I was 18 at the time and my sister was 20. She is a few inches taaller than me and has A cup breasts but with nice large areolas and nipples. I am 5'2" 105 pounds, red hair, and a nice 36D size chest. My sister is also a red head. Her name is Michelle. We had always been close so it was quite natural what happened.
We got home one night from a family reunion and the two of us could not have been more bored there. Michelle was talking about how she missed being away in college because there was so many more cool things to do there. I asked her like what. She looked right in my eyes and said she liked kissing all sorts of people.
I said what types of people and she said girls. She already knew that I had experiment with both sexes. AS she told me that she likes to kiss women on the lips and other places our hands brushed against each other. We looked into each others' eyes and started to smile. I leaned over and kissed her on her lips. Her eyes opened wide in surprise but she slid her tongue into my mouth.