A notebook... he hadn't really thought about writing things down, for the most part, although he does still have the note his past self wrote. But now that the option has been presented to him, it makes sense to do it. Maybe it'll make things easier to sort out.

Something close to a smile crosses his face for a brief moment. It's a thoughtful gift, just like the boy himself. He reaches over to ruffle Diarmuid's hair affectionately.

"I'll make good use of it."