you were the new creepypasta/proxy so Slenderman told Ben to watch you and make sure you didn't get into any trouble. One day you were swimming in the lake that was about a ten minute walk away from the mansion. Ben watches you swim but he gets bored so he plays games on his phone and when he looks up from his phone your gone

"Y/N?... Y/N!!"

he called out for you in a panic to find you