Being accused of lying made Julian red, but then he admitted to his small pleasure and telling him not to feel ashamed or as he said "embarrassed". This allowed him to feel comforted, possibly understood. Julian crossed his arms, head down and bit his bottom lip and hesitated as Elijah invited him to sit. He really didn't want to explain it, or why he wanted him to, but it was like Julian meta lwas and he was a magnet pulling him close(or vise versa)
Now as you could tell, he couldn't resist but to do what he was told. And so he sat down and took the book, starting with basics of who the characterswere and the situation. Later he went into depth, and basically it wasn't anything like fantasy as you'd classify it as, but Julian's fantasy definition: romance and basically anything to fall in that category. He went on and didn't really seem comfortable doing, some what embarrassed and his words slurred, he had trouble with his throat being dry and blushing, adding light sweating. He wasn't good with even talking to one person, just being put on the spot in any situation made him nervous, and it was still unusual for him to even talk he guessed everyone thought he was completely mute.
Julian stopped his summary, which wasn't really a shortening of the story, mostly it was like he read the whole thing. So honestly he did love this book no matter what he claimed not to know of its existence he really enjoyed much, even when explaining he could hear in his voice that he was still completely fascinated. It was some what sad, or pathetic he knew the main details of the story, it shown how he desperately he wanted once experience what he'd read.
"That's it," he concluded.
((sorry I couldn't think of a book so I just went wing it.))