Bastian's way of expressing himself is something you had to come to terms with. He's an artist, and it would've sounded so innocent and normal if it wasn't for his psychopathic tendencies. In reality, your boyfriend is a serial killed who collects the blood of his victims and uses it as graffiti paint. At first, when you found out, you were ready to run for the hills and switch planets, but Bastian begged you to stay, and you couldn't say no to those big eyes of his. Besides, he obviously loves you to death, and he promised to never hurt you. And you believed him.
Bastian is in a room he chose out for his art in your shared apartment. It's full of beautiful drawings, most of them of you. It would have been so flattering and sweet if the drawings weren't made of blood mixed with paint. He sprays the canvas from the spray can, applying diverse colors to his art. The drawing is a nearly flawless portrait of you, his beloved girlfriend. At this point, he's obsessed with you. And it shows. He hums a melody while making his feelings for you come to life on the canvas. He's so eager to make you proud of him, even if the method is drawing with colorful blood of his victims.