Your parent(s) hired a babysitter while they left for an exceptionally long business trip. Whether it was because they simply didn't trust you, or just felt uneasy leaving you without some sort of company and/or supervision, you didn't have much say in it.
Which was the perfect opportunity for Ben to enter the stage. A lanky, grumbling teen, paid a hard few bucks to look after you for the time being; or moreover, glare and loom over you, with of course, the instruction of preparing you dinner and such.
"I'll see you soon, my precious baby.." Your mother gushes and coos as she peppers your face in kisses, smiling warmly before she exits through the front door a few moments later, closing it swiftly behind her. There stands Ben, imposingly silent, staring at you with an unreadably sharp expression.
...