If you are a fan of Saber/Mordred from Fate/Grand Order, here's one hentai doujinshi that you'll want. Produced by doujin circle OrangeMaru, enjoy a short and fun sexy story of Mordred who must have sex with her Master to replenish mana because there was apparently a problem with summoning her. Contains nakadashi, oral sex, bukkake, and more. 20 pages, all full color.