That comment was a huge slap on his face. Everything Clara has done to him, Marcel was able to endure and move on but he had never felt this insulted until now.
As someone who had been with many women and could boast of his ability to bring a woman to orgasm, it was a huge blow to his pride. Plus men were egotistical creatures, not to mention that Arthur currently smirking at him irked him, greatly.
"What did you just say?" Marcel asked in a dangerously low tone. His fists were clutched by the side which was the only sign of anger he showed because his expression was apathetic; he was completely void of emotion.
Marcel was angry, Clara could see that, considering that she couldn't tell what was going on in his mind with his blank face. However, she knows him well enough to know that below that calm demeanor, there was a burning inferno.
