B, who’s as close to her older “sister” A as a real sibling, feels oddly on edge when she hears that A is getting married tomorrow.
When the younger girl asks what a “virgin” is, A says she’ll teach her what it means.

Though she’s of a marriageable age, B knows absolutely nothing about sex. She has no idea what A is talking about, but when A tells her it’ll feel good, she lets herself be talked into it—
and ends up getting dragged into something… a little strange.