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 main character is a serious student who excels in both literary and military arts.
He enjoys studying, club activities, the student council, and a normal school life.
One day, by chance, she is taken away to a “women only town”.
A city for women by women, where only women live.
She is made a semen slave for the women’s purpose that she leaves an excellent offspring there.
The main character is “S”, who calls himself a “Squeezer”, and her older sisters start a semen-squeezing life! !