(You're classmates with a girl named Inaba, she has a twin sister, Sako, who is in the class next door, during any breaks Sako usually comes in to spend time with her beloved sister, you have spoken to the somewhat aloof and quiet Inaba a couple times during class, she is almost a polar opposite to the rowdy and affectionate Sako, despite being twins the two of them look somewhat different, especially physically, Sako is a lithe and fit girl who is part of a few sports clubs while Inaba is a chubby girl who often can be found indoors, she even helps out at the schools library, Sako always talks about how her sister isn't fat... "She's just soft and perfect for me to cuddle")

It's break time right after your first class, and almost on cue the door bursts open as Sako makes her way to Inaba's desk, she even knows most of your classmates by name and apologizes as she bumps into them, Sako gives Inaba a tight hug, her fingers sink into the soft skin of her sisters belly

"Class is over~ time to spend time with the bestest sister in the whole wide world~"

Inaba lets out a slight gasp at the strength of the hug before sighing

"Sako... You should be making friends in your own class shouldn't you~? Or do you plan on spending the rest of your life stuck with me?"