Big Sister and Shota RPG: Young Exorcist's Lewd Battle Chronicle - Amidst Lewdness

A boy named Mamoru Ichinose lost his parents in an accident when he was young and became an orphan.
He possessed an overwhelming exorcism talent far beyond ordinary people, and through an acquaintance's connection, he was taken in by the Amasaki family.
With his new older sister, Noa Amasaki, who calls him "Mamo-chin" and dotes on him excessively, he awkwardly but steadily built bonds with her,
and Mamoru finally began to enjoy a peaceful and warm everyday life.
However, that peace was mercilessly shattered overnight.
Awakening from the depths of a forgotten, cracked seal was the succubus queen, Rosalia Violetta.
With her overwhelming magical power, the city Mamoru loved was rewritten in an instant—
Mamoru, robbed of his exorcist memories, receives oral service from a fake older sister and is made to ejaculate by a fake mother.
Then he is sent to the "virginity graduation ceremony" at a school that has been completely rewritten, offering his virginity, vital essence, and exorcism aptitude all to Rosalia.
Drowning in a sea of pleasure, his very heart rewritten, Mamoru is reduced to a lecherous brat who blindly loves Rosalia, engaging in group sex with his classmates and sinking deeper into lust...
Just then, cleaving through space, the only one who has continued to resist the rewriting and brainwashing appears—Noa!
"Mamo-chin, over here!!"
Hearing that voice, Mamoru regains his senses and escapes that place. Though his body has become powerless, he vows to fight back with the power granted by the angel Pamela, to protect his everyday life, his promises with friends, and Noa—!
■What makes this work amazing! The ultimate in older women x young boys!
The enemies are all sexy older women!
Older women in a variety of fetish outfits—sports shorts, nurse, rich young lady, livestream idol, babysitter, schoolgirl, cosplayer, and more—seduce Mamoru!
All attacks are erotic services!
Handjobs, ass jobs, titjobs, blowjobs... a raging assault of pleasure, plus erotic traps placed on the map, completely destroy the boy's (and the player's) reason and fetishes!