Kaiden had snuck out on the day that his father planned on summoning El. What good would there be if he stayed there? Especially after confirming with Amias that it was El who bothered Gideon.
'I need to be with Gideon in case he does something'
That is what he thought and because of his surprise visit. He actually had to stay some distance away from Gideon's place. It was still bothersome that Gideon lives with Theodora. Maybe once they're deeper into their relationship, he'll bring up the idea of moving out of their current homes and just live together. He rang Gideon's phone and waited for him to pick it up.
"Hello?" Kaiden hesitantly greets the person on the other end. He has to make sure it's Gideon he's talking about before he blabbers about being nearby.
"Hey. Why are you suddenly calling? Aren't you busy around these hours?" it was confirmed that it is Gideon on the other side of the call. But still, maybe Theodora was listening to them.