@blackbutter She bit him because it’s symbolic. He gave her pain from taking her virginity, so she bit him to give him pain back. That way they would be even and he wouldn’t feel like he owed her anything by taking her virginity. She cares, but she doesn’t want to hold him back.
His body withstands the starry sky storm, but a bite can draw blood? I never understood why the author created this crap between them, and worse he continues to drag it out over hundreds of chapters and nothing changes.