It took a few days for us to get a chin-up bar installed, but it's finally in and we've proceeded with the next round!
Since we're indoors, the bar's going to get pretty hot just from the fire I lit, so I don't expect there'll be much need to heat it with anything else or electrify it. I also misread one of the posts somehow and ended up putting clothespins on her nipples instead of hooks through them... I'm a little worried they're going to give out before Aiko does, but we'll see how it goes. She's looking pretty strained already and I doubt she'll hold out against that vibrator for long.