The third option was picked by Kou from the last chapter. (Do nothing and go back to your room to watch them "get it on")
WARNING: this chapter is basically porn because Kou picked this option in the last chapter. So if you are going to blame anybody, blame Kou and not me :)
Despite knowing that her dick has is probably to big for anyone to handle, you don't have enough balls to step in and stop what is about to happen. All you can do is sit back and watch to see the event unfold. You begin to head back to your room, and while you only somewhat know what is going to happen with them, you already don't feel good about it. You think you might as well enjoy the show so as you walk back to your room, you secretively rub the underside of your dick's shaft to get it erect. On your way, somebody stops and looks at you. You stop and look back but as soon as you do, She bolts away as if she didn't want you seeing her. Who was she? Doesn't matter right now, all that matters as that you make sure Yoko is alright, or get off watching him and her. You open the door to your room, and make sure you bolt lock it. Slowly creeping towards the hole once again, you hear their door slam shut as well as Yoko saying "I'm ready Shiina". You are currently unnoticed and you hope to keep it that way. Looking at them through the hole, you see Yoko being pulled to the bed by her, and once she lightly chucks him onto the bed you know there is no way Yoko can turn back.
Shiina starts off slow by taking off his pants and licking around the tip of the partially erect penis. She licks until the penis is rock solid and sits on it with her back to Yoko. You can see a huge bulge in Shiina's pants and it goes up her shirt and seems to end up between her boobs. Yoko begins to rub her huge dick through the shirt from the base, and all the way to the tip as Shiina bounces up and down on him. As Yoko feels the dick with his hands, you see the shock on his face when he realizes how massive it is and that it will probably end up inside of him. this realization makes him free his hands slightly, and as soon as he does, Shiina flings off her shirt showing off her breathtakingly large boobs which are bouncing just as much as she is. It also shows off her penis that was hidden there, which was almost erect enough to touch her chin. Her dick drops down and the upward curve on the shaft really accents the tip of it. She continues to ride up and down on his dick and comes to a sudden stop, you see cum, dripping down Yoko's legs and assume that Shiina's ass is gets filled with cum. She says "Now its my turn!" and does a light, slightly creepy giggle as she gets up and puts her dick right in front of his mouth. Yoko moves back in shock at how big its grown over the time they have been fucking, but Shiina puts her hand on the back of his head, forcing his mouth onto the cocks throbbing tip. She brings up his arms to help rub her cock as he sucks it, as well as rubbing the cock herself for maximum pleasure. Over this time period, you have been rubbing yourself and you now look down to see that you are dripping wet with cum. This action along with you rubbing yourself has made you cum almost as much as Yoko and you didn't even realize it. You continue going even though it feels weird rubbing your own slippery wet cock, and you look back to see that Yoko appears to be enjoying the cock he is tasting. His eyes are closed as he and Shiina rub the dick which is wet with some of Yoko's cum as well as the spit on the tip. Shiina's eyes are also closed, she appears to be enjoying it more than anything she has ever experienced in her entire life. Suddenly Yoko's eyes open frantically, you see his Adam's apple going up and down and wonder what is going on.
Thick white cum starts pouring and spewing out of Yoko's mouth as Shiina uses each stroke to pump him full of her almost limitless amount of cum. Even though you can see Yoko's Adam's apple going up and down a lot, he cant swallow all of the stuff that is being pumped into him. The enjoyment on Shiina's face as she goes through this is beyond words. The cum is flowing all the way down her own dick, as well as flooding Yoko's body, and with her final stroke, letting out the last little bit of cum left in her, you see something odd. While you are Kou and you still love balls you see past them and see that she has a vagina that is hiding behind her balls that is soaking wet. The floor is covered in what has been dripping out and as soon as Yoko sees it too, he procures a grin on his face.