It was the summer and I was 14 and my sister was 13. Our parents worked so we were both home alone all day. It was the morning and I was about to take a shower and go out for the day with my friends. I was in the living room jacking off and my sister walks in. She likes what she sees and asks to touch it. She starts jerking my cock and I told her to put it in her mouth. She does and it was my first time. I pick her up and put her down on the couch and take her clothes off. I ate her pussy and her ass and she was moaning so loud. I told her I wanted to fuck her and she was nervous but I told her it would be alright. I had to lube it up and it took a couple tries but I slid it in and began slow. She told me to go harder and I started pounding her. I came so much inside her and all over her crotch area. We both got in the shower and I got very hard again and I fucked her from the back in the shower and made her cum for the first time. I pulled out and nutted all over her fat booty. I showered up and called my friend to get the plan. I rode my bike to my friends house and we chilled all day. I cant describe how good I felt that day because i had gotten head and fucked for the first time but i couldnt let my friends know because it was with my sister. I did not think it was weird because honestly my sister is very hot. She is very pretty and has nice legs and a fat ass. I would fuck her again she has only gotten better with age.