Given that it was their last day at the base, Lucifer had very little intention of staying on the Enterprise. But he'd just dropped off four bags of new clothes in his room and then had been distracted by a conversation that led him to the mess hall.
And there he'd spotted Seven, so he figured he could pause his quest to spend the rest of his credits before departure to meet the ex-Borg who intrigued him for multiple reasons.
"What are you doing on the ship?" Lucifer asked, bypassing formalities. He'd seen member of the crew out and about, but somehow it didn't surprise him that Seven was somehow working, from the one conversation he'd had with her.
"It's not like we're leaving first thing in the morning, or anything," he added.