[He lets out some kind of squeak as she hugs him, once again tensing and trying to carefully push her away to prevent the pudding in his pocket from getting crushed, as well as the terrible anxiety when it comes to unprompted human contact. Once there was enough distance he took a few steps back, fidgeting but still trying to smile]

I-I'm glad you're excited but... uh...

[Taking a few moments, Latvia tries to think of the best way to say it without sounding too harsh]

If you hug me without warning, it's a little surprising and it makes me uncomfortable... I don't mind, really. Just ask first in future. O-okay?