She's breathing hard and staring at him.... So either:

1) Her life span is running out.

2) She is going into heat and will want to mate.

3) She is getting a hunger for human flesh and will want to eat him.

4) A plot twist event we didn't see coming.

I'm thinking 1, but I hope I'm wrong.

Riha nearly transferred all of those mysterious tatoos, meaning whatever happens something nasty is about to happen.

2 and 3 wouldn't really make any sense, as she has no sex organs and she's a hemovore.