What is this jerk doing to me???? ( Athy x Lucas)

I do not own any of these character. This is just my favorite manga to read <3
Also I do not own this art, @elmamaria95 . It's my favorite fan-art of them:
Athy meets a strange man with beautiful dark ruby eyes, but before she can get to really ask who he was he disappears, leaving her to question for so long. On night sitting on her bed she say a mysterious tall black figure outside of her doors to her balcony.