Mary had insinuated that future Johnny didn't know who her parents were, but it didn't make Jo any happier about the whole thing. It was still weird, though maybe a little less weird since Johnny and Mary were closer in age here.
Regardless of whether it was weird or not, it was pretty clear that he cared about her. That counted for a lot in Jo's book. She looked up at him.
"You do realize that if you hurt her, I'll hunt you down."