Sakuseishi no Oneesan -Josei Dake no Machi de Seieki Dorei ni Sarechatta Boku | 搾精士のお姉さん ~女性だけの街で精液奴隷にされちゃった僕~
The protagonist is a serious school student with both a literary and military background. He enjoys studying, club activities, student council, and mundane school life.
Then one day, by a strange turn of events, he is taken away to a “town for women only”. A town for women, by women and for women only. There, the women’s goal of leaving behind excellent offspring is to turn them into semen men.
The protagonist is taken in for sex by “S” sisters who call themselves “sperm extractors”. The life of sperm being squeezed out of him was about to begin!