Based on the erotic manga by Yoshiron.

I'm curious. How do animators animate anime?

Quite long procedure is used in animation and the episode or movie requires a lot amount of time and dedication and thus few steps I know- Sketches are created in rough pattern then frame by frame they are made in form of series.(still rough). Second now these sketches are finalized and are still uncoloured and then they are coloured as the per character. After that actors give voice to these characters and finally after so much dedication they are created. I tried to be as brief as possible this process is much more complex and time taking would be quite difficult to explain.
It also differs from person to person and style to style.