Things like coincidences happen, but is this really one?

There was a field trip, and you were the last one to get in the bus. There were no empty seats and the teacher ordered you to sit on someone's lap, since you can't back out. No one volunteered except for one, Scaramouche. You wanted to get off but there was no choice.

You felt uncomfortable on his lap, so you wanted to move abit forward. Then, you felt a hard thing in the back. "Fuck, stop moving." He covered his face.