Heh, – if it helps – I was operating under the assumption that a clitoris rubbed too frequently would also get stiff, from inflammation, and it'd work in any scenario. Though – admittedly – "stiffy" is often used as slang for an erection, I wasn't making any assumptions about genitalia.
I can absolutely delete my original comment (and this one), if any of it makes you uncomfortable, regardless the reason. I can definitely see how that'd be annoying or bothersome, etc. Just let me know and I'd be more than happy to (/gen).