"I did ask about you," Lucifer admitted. There was a display of men's shirts not too far away so he wandered over to it, nodding approvingly and then checking the price, calculating what he could buy with his newfound wealth. It was nothing compared to what he had been accustomed to, but at the very least it was building on a ridiculously limited wardrobe.
"Which of these?" he asked, holding two rather similar shirts up as he walked back to Castle. Kate was still changing. "So was I right?" he asked loudly enough for her to hear him through the door. "I unofficially had a bet going with her over how you'd react to something."
Of course, that was counting on the fact that she'd told him, but Lucifer couldn't imagine that she hadn't, after months of guilt.