A memory of two days of secretly having sex with my adolescent cousin who has recently grown big breasts at my hometown

My grandmother's house has been visited for the first time in a while. Until I met that girl, I thought the melancholy time would begin to be surrounded by relatives. A girl who lives with her mother and is three years younger than her. I remember myself in elementary school, but now I've grown into a woman with shiny skin and breasts that have grown so big that her uniform looks like she's coming off... A secret summer vacation that I can't tell my parents about puberty and sexually interested cousin.