The Plight-Trothed Bride

Hermione, Ginny and Luna, sharing a girl moment, decide to cast a Pairing-Plight Troth Charm on themselves for fun. For Ginny, the results are exactly what she expected, Luna, she was only mildly surprised. However, for Hermione, the results were disastrous! She thought she'd be paired to Ron and live happily ever after. So what happened and why did she see Professor Snape?