Noticed this concept pop-up recently ((cock-lock (チんポロック) and halo lock (ヘイローロック)) on Pixiv with Wabuki doing the first 15 with inspiration from a story on pixiv which the first image is kind of explaining; basically Kuromaru is brainwashing and/or forcing girls into his service. Toki is more or less full-on brainwashed while Kuromaru used breast expansion and dick growth on captured girls, then "locks" their breasts from releasing milk and dick from being able to orgasm (along with making them even more sensitive and making them feel good) until they swear their loyalty and do as commanded (like kidnapping others to bring under their service) as the only way they're allowed to get any release. Following swearing their loyalty their halo moves from above their head to at the end of their dick - where their personality is now stored, in the written story anyway. Not fully sure if this means their body is now puppeted by Kuromaru, but their normal halo is then replaced by one with the eye-shape.
The halo lock ones are thoroughly under the affects of brainwashing with any sort of sexual desire locked and obedience to Kuromaru prioritized; they basically are there to coax the cock lock ones into obedience, and are allowed use of their bodies to arouse those they're trying to convert.
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