Derrick's complexion turned paler when he heard Ciel's question.
He coughed a few more times so he looked like he couldn't say anything even though he seemed to want to speak.
Ciel didn't care about his reaction because he only cared about his mother, the woman who had lost the bet to him.
What was quite surprising was that the woman's reaction didn't look so bad, she just looked confused, very different from when Ciel said he wanted her to be his woman.
Perhaps for her it was a very serious insult that she was so angry, but losing a bet was normal for her given her personality that was always in a hurry to decide things.
Basically, she was not that surprised by the fact that she lost the bet.
It was just that the amount she had to pay made it difficult for her to react.
The case would be different if she was someone shameless who could shamelessly walk away after losing a bet without paying at all.