It actually sends a stab of fear through him, to realize he's being so observed--and that he let his guard down so much. Loki tenses, then realizes what Delta's looking at. He tilts the spine of the book up to a better angle for Delta to see.

Can this be all right? What could hurt to share something so simple as a book? But distrust of other males is a habit that's very hard to break. He'll need to find some sort of handle on this Delta, so that he no longer feels at a disadvantage. Being able to simply overpower him isn't enough; Loki's never been one for simple brute force.

The book is a tome of craft lore, one of Frigga's that he hid away. It's a rather arcane thing, but he finds it fascinating.