I played a bit with ice cubes as a teenager. The girl I was dating was sitting in the living room; my parents were home (somewhere) at the time so I was enjoying trying to get her off while fully clothed. Spontaneously, I decided to get an ice cube from the fridge. I hadn't told her - she was sitting out the couch looking rather flushed, and I came up behind her and reached into her blouse, squeezing her breast. She had this lovely soft bra that I could easily get my hand into. Mmm.. free access.
At any rate, I did that for a bit before reaching in with the ice cube (now melty and dripping) - that gave her quite a start!
She used to have this expression, a sort of smouldering horny look. There wasn't a trace of pout or guile, but an overwhelmed, "I'm wet" look that bordered on disbelief.
Still standing behind the sofa, I leaned over her and pushed my hand into her pants - she obligingly parted her legs and leaned into me. I masturbated her for a bit, before once more swapping in the ice cube. That made her jump; I'd leave it melting against her clit for a bit, or lower, at the entrance of her vagina, then take it off and masturbate her some more until she warmed up.
That was working wonderfully until the ice cube slipped out of my fingers and into her vagina. I think that was a bit too cold for her - she hopped up and waddled to the bathroom and all the fun was over. 😕