...Okay, that's normal enough and the sort of thing he might guess at (though Gordin has no idea about fashion, so if he buys Annie something excessively frilly or ornate then it can just be blamed on his ignorance). That's a good sign though!

"...Oh." Well now he just feels daft, and it shows in how red he goes. Inconveniencing the poor girl for what...A few minutes' walk? How uncouth!
Not that he's going to risk a verbal meltdown in front of her, oh no; just excuse him as he worries furiously at his belt for a second, before managing to spit something out. "I, um. Thank you! Hahaha..."

Awwww yeah.