This website contains age-restricted materials including nudity and explicit depictions of sexual activity.
By entering, you affirm that you are at least 18 years of age or the age of majority in the jurisdiction you are accessing the website from and you consent to viewing sexually explicit content.
I did it a little while ago. Was very easy. Download books with kindle app, load them into Calibre and use a one click plugin to strip the DRM. I think this was the step-by-step I used.
https://nerdschalk.com/remove-drm-kindle-books-de-drm/