She wanted you to impregnate her to prevent herself from being engaged!

After arrived at the Kamiya Mansion, which appeared to looked very much like a Japanese castle in your view, Setsuna instructed her maids and butlers to lead you, Maribel and Martina to the rooms she picked for you and your lovers.

Maribel and Martina are quite annoyed that they are not going to get to sleep with tonight. But they let it go after Setsuna let them in on a secret. She needed your "help" because her father is trying to get her engage with one of his friend's son for the sake of their alliance. But she does not love that guy and you even heard that he also have a girlfriend of his own as well. And since her father is not at home today, she decided to seize the opportunity!

You, however, is completely unaware of what the three girls are up to. So by dinner, Setsuna has her chefs prepared the meal in the form of yakinuki, in which you and the girls have to grill the meats and vegetables on your own. During the meal, Setsuna also have her maids served you, Maribel and Martina sake as well.

As time passed by, you and the girls are completely drunk. The first phase of Setsuna's plan has been properly and smoothly executed. But also unknown to her, you intentionally got yourself drunk as a way of finally be able to "sleep with her" tonight as well!

Completely unaware due to being drunk, that you're going to Setsuna's room alongside her after the dinner ended. And when you and Setsuna finally entered her room, this is where the fun you will most likely never know had happened have happened!

"Oh! Oh! Oh! Oh! Oh! Oh! Oh! Oh! Oh!" You and Setsuna moaned as you and her are lying on the futon with you're pumping her bleeding pussy with your erected penis. Your right hand is squeezing her left boob, which is so large and soft, while her right breast, which is also large and soft, is being pressed by your chest.

Minute by minute, you increased the speed and begin to fuck her faster and harder! Under the influences of the sake, you and Setsuna silent each other by kissing one another deeply and playing with each other's tongues.

Now, the head of your penis finally reached the entrance of her womb and is beginning to ramming it relentlessly like an army of besiegers trying to break into a city by using a battering ram! Each thrust resulted in your cock getting bigger and bigger due to the sexual pleasure you're receiving and the sperms being build up inside too!

Twenty minutes later, you feel like you're getting close. Setsuna too feels it. She is getting close as well. And together, both of you cum at the same time!

"AAAAAAAAHHHH!" You and Setsuna screamed together in unison as you're cumming inside of her! As you're releasing a wave after wave of your semen into her, one of her ovaries also responded to the sexual pleasure by releasing an egg into her womb.

But as you and Setsuna are cumming together, you and her also feel something strange happened! You are feeling like your cock is being frozen below zero temperature but also burning hot like a volcano at the same time! Setsuna also feels this too! She's feeling like her entire womb has become a volcano but also feeling the great cold inside her womb at the same time!

"WHAT IS GOING ON WITH MY COCK/MY WOMB?! I'M FEELING VERY HOT AND VERY COLD AT THE SAME TIME DOWN THERE!" You and Setsuna thought at the same time while you and her are screaming in pleasure as you and her are cumming together! Unbeknownst to you and her, you and Setsuna are exchanging each other's elemental magical powers through intercourse. But due to that both of you have already possessed the mystical powers with the same elements, the magical energies that are being exchanged also increase each other's magical powers tenfold!

However, the night is far from over because neither you or Setsuna are yet to satisfied! So without hesitation, you and her immediately begin another round of baby-making session!

And twenty minutes later, you ejaculated inside her again while another one of her ovaries also responded by releasing another egg into her womb. And then, another round begins! And just like lasted time, both you and her reached the climaxes together in just 20 minutes! This resulted in another set of waves of your sperms being unleashed into her womb while one of her ovaries also released another egg as a response. And each time you and her reaching the ending of each session, both you and her always feel strange down below due to the exchange of magical energies that occurred there.

And now, you and her are having the forth round together! With so much energies have been depleted, this is most likely going to be the last round between you and Setsuna.

After having ramming the entrance of her womb for another twenty minutes straight, you felt the urge of needing to do it as you're reaching an orgasm. So without hesitation, you bombarded her womb with very massive load of your semen! Setsuna too has reached her orgasm and that resulting in the forth egg to be released from one of the ovaries into the womb! And just like the previous three rounds, this ended with both you and Setsuna felt strange sensations down below as well.

Once finished, you and Setsuna fall asleep after devoting so much energies into fucking one another. And between Setsuna's legs, her bleeding pussy is forming a red spot on the futon. Inside of Setsuna's womb, her four eggs have been penetrated by your sperms and beginning to be fertilized. As they are being fertilized, they then taken roots within the womb in order to develop as babies. Now, Setsuna is officially pregnant with quadruplets and they all are going to born as Human-Oni hybrids.

But oblivious to both yourself and Setsuna, you and her have become magically forty times more powerful after exchanging each other's powers through four sessions of intercourse.