[So. Vash has shown up dead and bleeding on the dimensional library's doorstep. Ydalir has stocked her shop with an item that, while romantic on the tin, will let Ain keep track of his partners... and Ain fears that if he takes his eyes off of them for a second, one or all of them will show up dead like Vash did.

It makes him insanely anxious. Ezell doesn't need help sensing emotions, but Ain does. Ain needs to know where Ezell is at all times. Ain needs to know if Ezell is scared so he can show up and kill whatever it is making him fear for his life. Ezell needs some of Ain's powers to keep himself safe in case Ain can't get there in time.

Of course, Ezell will probably feel Ain's emotions from a mile away as the little faun springs up to Ezell and suddenly slaps a bracelet on his wrist, but the sudden feeling of knowing exactly where Ain is will no doubt be new to Ezell. He doesn't say anything, not at first, as he hands Ezell an amulet and sits down next to him, wherever he is right now.]

...Vash is dead. And I don't want anything bad to happen to you, and to be unable to help. So... if you could just wear this so I can sense where you are and how you're feeling, and sometimes send you messages when we're apart... and the necklace, too, Ms. Trader said it would let you borrow some of my magic a couple times... that would make me feel a little better.

I don't want you to leave me like he did.