I have some ideas that might be interesting.

Since your headfuck seems quite mature now, will it be able to do a head implement, like simply stick a pole from below the chin, or from the neck hole, then out of the top of the head?


The moving parts could be a twitching eyelid, rolling eyeball, and dripping blood?


A decapitated head would be great, but if you choose to penetrate a girl's jaw, I think twitching fingers trying to grab the pole would also be arousing.