Could You Turn Three Perverted Sisters into Fine Brides?

Our young protagonist faces the greatest challenge of his time. Babysitting and rehabilitating three massive perverts. Their rich father has given him the arduous task of turning them into three young, refined ladies. But don't sweat the details. You're here to self-insert, right? Just pick your waifu: masochist senpai, nympho classmate, or exhibitionist kouhai.