What are you?

"Mommy, I found out your secret. I knew that you were a spy. When I saw the same logo from your computer on your phone, I went to check the mobile version. But then, someone messaged me and told me there was only one person who can access the system. The phone glitched right after that and then it got reset."

Heaven instinctively held her breath, barely taking in some keywords from Sebastian's statements. When she huffed quietly, she planted her hands on his shoulders. 

"Basti, did you mean that logo that looks like… a reaper?" she asked quietly, watching her son purse his lips into a thin line. "How…?"

Sebastian puffed his one cheek, sliding his eyes to the corner as he confessed. "I went through Mommy's computer."

"Basti." Heaven slowly straightened her back. 

Heaven set up her computer so that even if someone would go through it, they wouldn't notice something important was installed in it. How did he find that secret software?