Taking the lessons you learnt about human anatomy into account, you made up your mind. Avoiding the smaller hole that leads to Shizuka's anus, you decided to go for the "bigger prize": Shizuka's pussy. You're not sure what was going to happen if you go in, but you decided that you need to show Shizuka that being smaller does not necessarily mean you are powerless. Rubbing your hands together, you started climbing the light purple fabric that is Shizuka's panties, and got into position. You jumped towards Shizuka's crotch, grabbing onto a few strands of pubic hair. Luckily, Shizuka had not felt anything ... yet. Gently, you made your way down Shizuka's crotch, and made your way towards Shizuka's pussy. It looked like a fleshy cavern with lip-like features to you.
The more you stared at the pussy, the more you are determined to do this. You placed your hands on each "lip", and placed your head inside the pussy. Looking up, you saw Shizuka's vagina. It looked like a red, fleshy vertical cavern in your position. You decided to go ahead with climbing, and even though you were not in the peak of physical fitness, somehow this empowered you with strength you never thought you have. Like the protagonist from "Ninja's Code", you mimiced the movements of vertical climbing, using the fleshy red walls to pull yourself up.
As you climbed further up and deeper into Shizuka's vagina, your actions inevitably got Shizuka's attention. Shizuka found herself "turned on" for some reason, but as it was still in the middle of class, she decided to just wait until later before finding out what it was. Meanwhile, you managed to get yourself deep inside Shizuka's vagina. No man, or even their "cocks", has ever been this deep inside Shizuka before, you thought to yourself. Right up ahead of you is the gateway to Shizuka's womb: her cervix. Shizuka was already being turned on by your climbing, and you could continue this for a while, at least until lessons were over and Shizuka starts "investigating". Then again, vertical "spleunking" inside a girl's reproductive system has never been done before, and this could do wonders for your reports on biology in the future.
What is your decision?