The Vendor of Pain

The Vendor of Pain
--in the tradition of Ci, of the form: Linjiangxian

I received a challenge!
Yessir, says the sender
Girl, your chances are slender
chant your sundown song
Cindy, surrender

I'm an obstinate ass
could be a contender
for most patent pretender
But, she set me straight
Pain? She's the vendor!

Chinese fixed form poetry. The form Linjiangxian has 2 stanzas of 5 verses each, with 66,7,55 syllables. The commas allude to the rhyme scheme: xa,a,xa (x = unrhymed, and the last verse is always a rhyming verse, so a comma is unnecessary)