'It's Amon!' Lilith thought, her heart racing in her chest to realize that he wasn't wearing a mask. 'It's Amon sleeping on the desk, but why? Why here?'
Lilith's curiosity then kicked in. She heard from the Grim Reaper the reason why he wore a mask is for him to protect people from his uncontrollable power.
But damn... Lilith's just so curious to see how he looked like and now that he's sleeping, she wanted to take the opportunity to look at him!
But how?
Lilith looked at Amon's black hair that was blocking his face. As she was about to inch in closer, she remembered right here and then what the Grim Reaper told her about his powers.
He told her that he could kill anyone—willingly or unwillingly—once they have looked into his eyes. He told her that he could not control them that is why he wears a mask to regulate those people who can look at him.