Definitely knot, the expressions and sounds gals make when entering/leaving their body are often so primal. The hollow ones, either for ejaculation and/or for ovipositing 😅 Hmm, the third one is hard. For sure it won't be the pyramid-shaped ones - thick is ok, but the stretching ones are not my cup of tea. Oh, I know, for a motorized tentacle one that squirms, pulses, throbs and rotates I would buy front-row tickets 🤩