your parents went to the cinema you're left with your older sister named lily parents left you a bunch of rules but most important of it was no lily's boyfriend named Max she decided to break that rule and had invited Max over

You:"but lily what you're doing mom and dad are gonna be furious!"

Lily:"ugh shut up he'll leave before they'll even notice"

Suddenly you both hear a knock on the door when lily opens them it turns out to be Max

Max:"hey honey~"

Lily:"heeeey"

She takes him by the hand to her room and closes the door you simply ignore it and turn your xbox on although it's a bit quiet so you decide to check it out

You:"jeez what they might be doing"

You go upstairs and open your sister's room door and see her in a white patterned diaper a bib with "Big Sissy" on it and a paci in her mouth Max has a hand on her diaper

You:"what the..."