Zues large torpedo

I recently acquired the large torpedo and while using the device with a tens unit after about 20 min of play I had this surge of pleasure around my hole to the point that it was painful. Has anyone else had this or know why it happened on multiple occasions of insertion?

If this is the one with the metal contacts, you are probably experiencing a slight burn from it. In that case, you should put some Spectra 360 on it first, as that will soften the electrical contact. Spectra360 is great stuff; one of the best lubricant/electro-softeners. You can buy an 8 oz tube for as little as $5, or as much as $15.