He couldn't breathe, let alone think.
His heart pounded so much that it hurt.
There, on the bed, was his fiancée making out with someone he hadn't seen before. They didn't seem to notice him. What hurts more was that his fiancée was participating actively in the kiss the two shared. If he were struggling or something, he would've thought that he were merely being kissed out of his will.
But he's not.
When the occupants broke the kiss, his fiancée finally took notice of him, giving him a stare for a few seconds before going back to kissing his companion.
He just stood there by the door, frozen shock in place. He couldn't even seem to know what emotions to display at the moment.
He would've cried, but that was just plain pathetic even for him, after four years of being engaged to the man. He would've yanked the one kissing his fiancée and murdered him, but he couldn't move. He just couldn't move at all.
He faintly heard footsteps behind him, and a question. He recognized that it was Conrad, but his eyes were still glued to the scene that unfolded before him.
All that left the Maou's lips was,
"Why?"