>>1376133Some hentai shows are exceptionally good for screenshot material. Possibly one is the dorei maid princess series. Another is the Boin lecture and Boin resort series.
Just go to some torrent sites that have a large number of seeded hentai anime shows. The site I know of with the most seeded hentai anime is boxtorrents so give them a try. They also have a forum, so ask your question there along the lines of "Hay, wat R sum hentai shows dat R good fer making lotz of hentai screenshots?"