It is, in fact, a good sign! She also does like the way that he's experimenting a bit with his fingers. Trying to find what feels bet is good when you'll be with no doubt multiple partners, so... All she can do is keep guiding him in the right direction by being vocal.

When he does hit a good spot, she lets out an adorable delighted squeak. "Th-there," she encourages. "Keep going right there," she breathes out, voice cracking in a small moan.