Option 2, 3, 4

Your grandfather entrusted two special agents (or his ninjas) to protect you - but they were no ordinary guards. They were like built like heavyweight wrestlers, their sculpted muscles and intense gaze enough to intimidate anyone. Gaito and Mizuki were visibly terrified and you couldn't blame them.

As he left, your grandfather made a point to remind Mizuki, "Your body belongs to my grandson for the next three years! Whatever he orders, you must obey!" The gyaru slut opened her mouth to protest, but the fear of being given to the Yakuza to have her organs harvested kept her silent.

Your grandfather then dismissively handed Gaito a camera, "For now, your job is to be the cameraman! You will record my grandson impregnating his sex slave with my great-grandchild!"

"Like hell, I will!" Gaito shouted. But your grandfather's next words turned him pale, "If I'm not satisfied with what you record, my special agents will give over to the Yakuza in the morning to have one of your kidneys removed!" Gaito gulped and quietly turned on the camera.

You couldn't help but feel a twinge of satisfaction at the power you now held over your former bully and his bitchy girlfriend. With a devious plan in mind, you decided to have some fun with them both. "Strip," you commanded Mizuki, the thought of her as your personal sex slave making your dick rock hard.