I think they clash. Larry sounds middle aged and Crystal sounds... girly and younger? Laurence or Laurie would have been much better. I love the name Crystal, but it doesn't make sense next to Larry, Laurence or Laurie. Christina and Laurence would have been better. Both are well-distinguished, nice names.
https://youtube.com/@MarioDrama632 or
https://youtube.com/@Objects_2763 :3