More! Impregnate! Flame's Big-Boob Isekai Boobs

The protagonist, Tsujikaze Toya, has two secrets.
One: he is an extraordinary oppai lover. Two: he is actually a descendant of ninjas.
One day, after he opens an ancient scroll left by his late father, he is transported to another world along with his step-sister (big-breasted) and step-mother (big-breasted)!
That place is a dreamlike big-breasted spy academy, where everyone from the teachers to the students, and even the chairwoman, are big-breasted spies!
The spy academy is divided into three classes based on the students' respective skills, and the students spar and compete with each other every day.
The protagonist, who falls into the dormitory bathhouse, is chased around by the big-breasted spy students (naked) and finds himself in a desperate situation.
When the chairwoman finally appears, the protagonist thinks he is saved, but instead, he is entrusted with a "mission."
"Could you please help me find the enemy spy who has infiltrated this academy?"
It turns out an enemy spy has infiltrated the academy, and the chairwoman is at her wit's end.
It is said that a boy who crossed over from another world possesses a special skill and is destined to save the academy.
At that moment, the "Super Lewd Mission Skill" activates! A mission to put the chairwoman into heat suddenly begins!
Seeing the protagonist perfectly complete the super lewd mission, the chairwoman is convinced he is the academy's savior.
Use this skill to conduct lewd investigations on the influential big-breasted students and their mothers!
The target big-breasted spies are no pushovers either; they are also after the otherworldly information the protagonist possesses.
Engage in lewd information warfare with the distinctive big-breasted spies, and fend off the seduction tactics that come one after another!
Capture the enemy spies with the Super Lewd Mission Skill and conquer the spy academy!
"I'll use the Super Lewd Mission Skill to investigate the big-breasted spy students and mothers, and strip them bare!"
The protagonist accepts this secret mission, and his Mission Chinpossible co-starring with the big-breasted beauties begins!