Today I saw my friends butt

So basically im a dude shes a girl. We arent interested in each-other but we get along very well nd have been friends for years. Today at school she was showing me a photo of a spider bite she had on her butt a month ago. It was very zoomed in so i didnt even see nothing all good right? Well after i look away she says my name so i assume she wants to show me another photo of the bite, but apparently she wanted to show me her drawing she made. And right on her phone was her bare cheeks 😭. Lucky she didnt notice but i felt soooo bad bruh.