TW - Drowning

When I was younger I used to play pranks on my sister, Maria. She always fell for them, no matter how old we got. My favorite one to play was at the lake. I'd jump in and swim around for a bit. After a while, if I was bored - I was almost always bored back then - I'd begin to float. I'd wait for Maria to look away and then I'd roll my eyes back and make my breathing subtle. When she finally looked back at me she always panicked, running to get Pa. I wonder now, as I sink deeper, what will Maria do when she finds me like this?