Is forced sucking on a dildo required to get an e-stim reward?

Hi everyone, I’m new here. Just discovered this forum. You all seem like a wonderfully creative and kinky group—exactly where I belong. I’ve spent the last few hours reading and searching through your content. While I found some posts that align with what I’m looking for, none match it perfectly.

My goal is to control my ET-312B electrostim device using a relay. The idea is simple: attach two copper contacts to a dildo so that when my lips touch them, they complete the circuit and trigger the relay, turning on the output of my always-on e-stim box. If my lips aren’t connecting those contacts, I get no stimulation.

I’m currently unsure about how to pick the right relay for this task. Also, do I need some kind of impedance detection before the relay engages? Could someone provide more specific guidance? Thanks a lot! Image