The Cum Witch, breeding-oriented sorceress of the Sand Coven, has invented a new toy - a sleeve with suction cups at each end, for the two of you to both use at the same time
It suctions on to your body, licking and siphoning your energy, and wraps around her cock, which is long enough to extend all the way through and rub its dripping tip against you. As each of you fantasizes about the other, the device moves energy from one to the other... a struggle in which your genitals shrink or grow, and you become more submissive or dominant in the process - and the same happens to her.
In this version, you decide to give her a taste of her own medicine, winning her rigged contest and convincing her to worshipfully enjoy your newly enlarged length.
This audio makes no assumptions about the listener's genitals until after the transfer has occurred, at which point your cock and its control over the Witch is described in detail as you fuck, fill, and rut with her.
Another version, where you submit and become null, with no way of gaining pleasure except through pleasuring her, your crotch a genderless blank expanse she has siphoned away, will release really soon.