The Mane 6 are on the train to Canterlot for the royal wedding. Pinkie falls asleep from excitement, conveniently sitting next to Twilight at the time, when Pinkie wakes up and discovers that she was sleeping on Twilight's shoulder, her embarrassment gets the best of her.

She starts avoiding Twilight, and even stops talking to her. After the wedding, Twilight is going to find out why.

TwiPie story that takes place during Season 2, episode 25 and 26.

Has Cadence but not much, hence no Cadence tag to pass Moderation