You were veeerrrryyy tempted to climb through the hole, but eventually decided on staying in his pocket for now. Having fun now would be exhilarating, but you'd likely disturb him, and it would be better to have your fun in a calmer setting, maybe when he was sleeping, or taking a bath, or playing games.
You shrunk yourself a tad smaller, curling up in the pocket, staying aware of the sounds around you, in case someone mentioned a bump in his pocket, so you could retreat into the hole. You almost fell asleep many times during the day, as the class was something you had already learned, so it was a snooze fest. Eventually, after about 3 hours from your lunch time adventure, you heard a giant bell ring from outside your lair, and you poked your head outside of the pocket, staying vigilant of anyone that might see you. Thankfully, no one cared to look at some random boys chest pocket, so you were in the clear.
Eventually, the giant boy walked towards a large yellow vehicle, a school bus, as the laymen's called it. You gripped his pocket as he stepped up the steps, not wanting to accidentally fling yourself out of the pocket if he made a strong enough motion with his body. He reached the top of the steps and started walking down the isle, giving you an opportunity to look around. Eventually, your ride sat on a chair on the right side, near the middle of the bus, and you now had a choice to make.
You could stay with your giant and stick with your original plan, that is, to stay silent and with him until he got home. Of course, you could also take that hole now to explore his body on the bus. The third option would be to abandon ship and find a new big person to go home with. After a moment of consideration, you decided to...