In many ways that saying is where they bond locked into place, and not only the magical one. The emotional one between them, when everything blurred together and they never managed to pull back from there. It was the first time Istredd was completely confident when he said 'you don't' because he felt it. Lucifer felt everything but hate for him.

It's why it felt harsh when he didn't get it back, when it suddenly seemed like shaky ground when before it never was. To have it solid again is nice. Istredd glances over his shoulder and the smile he gives Lucifer is solidly his because there is no reservation in it. Just pure affection.

Stop that or I'll kiss you again. Not in front of the books. As if the books are sacred and he must give them all his attention now! If Lucifer irritating him didn't already help him relax from his anxiety, this makes it temporarily disappear entirely.

The woman, clearly the owner, within looks up at him when he cheerfully asks her about history, and she points toward all the way in the back. The non-fiction section is apparently deep in there. Unsurprising, most people prefer fiction. Lucifer could lose Istredd in there since it is a bit winding but there are many more books than he actually expects. He's absolutely delighted, he may as well be glowing on the bond.

"This is a gold mine," he says gleefully, fingers reverently touching the books as he searching the titles.