Zombie apocalypse au

It was 3 weeks after the initial outbreak. Lots of people where already dead or zombies. Lance was hiding in a superstore with a gun. Thats when Shiro comes and finds him. Lance hadn't seen a living person in weeks so seeing Shiro scared him. He held his gun up at shiro's head. Shiro puts his hands up.

Okay so! In this they could have already been dating when it happened or not and it leads to that.