Himitsu no Apartment (ひみつのアパートメント)

The protagonist is about to inherite the Kingsworth conglomerate. His father wants him to succeed him and eventually marry into an important family to strengthen the conglomerate. Because of that, an arduous training and studying regime will be imposed on him.

The protagonist stress starts accumulating to which the solution is tittyfucking! He absolutely cannot have intercourse with anyone but the girl he is going to marry; so his secretary along with his maids will provide him with the service he needs!