"Let it out... No one but us will hear..."
Lillian gave a shaky, but playful smile, "O-oh~? Y-you want to hea—... Mmh~... M-me moan that badly, Mari~...?" She intentionally let one out.
She then moved her lips into Marionette's ear, whispering, "Naughty girl~..."
Marionette's body stiffened and froze, her breath becoming even more ragged. The hand she was using to knead Lillian's breast also froze in place. Sensing this, Lillian continued.
"Y-you're reacting even more than me~... Where did my stoic baby go~?" She cooed, brushing her lips against the Assassin's ear. She then let out a small moan...
"Mmh~... Ah~..." Purely for fun. She continued to do it even more, despite Marionette's hand not moving. "I-it feels good, Mari~... Aren't you going to continue, baby~...?"