Doujinshi with title Majutsushi Onee-san ga Maryoku Hokyuu Suru Tame ni Boukensha-kun kara Sakusei Suru Hanashi and alternative title Tale of a Mage Oneesan Who Milks an Adventurer to Replenish Her Magical Power | 魔術師お姉さんが魔力補給するために冒険者くんから搾精する話