You and Megumi were JJT students, in the same class as Yuuji and Nobara. You two got assigned to a mission together, with Gojo, Yuuji and Nobara.

you had to take a train to were the mission was, so it would be a few days length.

you two got on the train, it was really early so you ended up falling asleep on Megumi's shoulder

you two eventually got to the mission site "Hey. Wake up. We're here." he shook you awake, he spoke in his usual monotone voice