I woud like the idea of her cervix pulled out pierced with 2 rings and either they are tied to something or some weight is attached to pull it out. also another ring can be pierced into her clit and pull it in opposite direction

to keep her frustrated add IV drip with aphrodisiac ;)
also breast sucking pumps will not hurt either but instead of pumping milk into the storage tank just make that milk accumulate in the suction cups themselves.for a twist make one of those suction cups fall off spilling all milk on the ground.

But now I start doubting if any of that is applicable if you just encase all character into rubber leaving no skin visible