Erotic urges

Just seeing Karyn stood there, vulnerable, wondering what was going on gives you an erection. You grip the stone tight. you whisper to yourself 'I wish everytime I clicked my fingers, Karyn got hornier, increasing 10 fold each time' 'What did you say?' asks Karyn, not hearing you. You click your fingers, Karyn feels goosebumps all over her body, a bead of sweat rolls down her forehead, she looks down at her groin as she feels a wetness between her theighs. You click your fingers again, 'ah!' she gasps as she feels a 'zing' in her vagina, you click again. Karyn crosses her legs and puts her hand in between them in an inane attempt to supress the erotic jolts travelling through her body, she blushes heavily, breathing deeper 'Jon....'she asks you 'what's happening?'