You worked at a small-ish coffee shop as a barista.

Ballister had walked into the shop, and waited in line for his turn, once it was his turn, he stepped over to the register and looked at you. "I'll just have.. A large black coffee, please." He didn't seem to be the most outgoing person, but he also didn't seem to be shy.

After he paid for the coffee, he stepped to the side to wait for it, but he kept glancing at you, for.. Whatever reason.