Javier's guitar was getting worn out. There were scratches in the wood, and half of the tuning pegs didn't tighten most of the time — not to mention the scorch mark on the bottom of the body, caused by a drunken Reverend accidentally hitting it into the campfire for a moment.
You'd seen how the instrument’s deteriorating state was upsetting your gang's personal musician, so you'd gone out of your way and bought him a gift. Buying it felt more… sincere than simply stealing one; emphasised by how you couldn't resist getting him the highest quality one you could find and afford.
Javier looked at you with slightly widened, surprised eyes as you presented the guitar to him. He seemed disbelieving that you'd really done this for him. “This is for me? ¿Estás seguro?”
Not one to look a gift horse in the mouth, with part hesitation he reached his hands out slightly to receive it.