Despite answering many of Saria's questions, Lucien didn't talk about Claire having a soul contract with Greed. But Lust's appearance to enjoy the relaxing bath with him makes the Mermaid Princess wonder about that.
"Hmmm…" She looks at Claire quickly before speaking to Lucien. "If you allow me to ask, does your other sisters also have such soul contracts?"
His expression turns neutral as he can imagine Saria's reason for asking that question. He can't help but quickly glance at Claire too.
'Greed is asking me not to reveal her presence.' Lust speaks to him mentally.
He doesn't want to lie, but he also doesn't want to provoke Greed further, making Claire's life more problematic, so he takes a while to think of an answer that doesn't expose that.
Saria notices that Lucien is in doubt about what to do, but before she regrets asking that question, Claire breaks the awkward silence. "Yes, we do."