Girls are gross

I remember my first kiss it was my 13th birthday and my friends told me they had a surprise for me but I had to close my eyes, I closed my eyes it was the weekend so I was at home and in my room my friends told me I had to sit down to kiss this girl, I sat down and waited finally a girl came in and I started kissing her lips it seemed like she was laying sideways so I thought oh well, finally I got to open my eyes and I was sooooo grossed out I had been kissing my own big sisters fat ass