And that's all it takes. The nuzzling is fine, but each breath against her gem causes her to suck in a breath and exhale it as a lengthy moan.

And when Peridots tongue hits it, it's all over for Lapis, who makes a choked noise as she cums right into her hand, leaving cum that drips off of it and onto the floor in a messy pool. If that's the reaction Peridot wanted, bingo. Lapis is now shuddering putty in Peridot's awful dragon paws, which she's using to brace herself more fully on now, since suddenly her leg strength has left her. How weird!]