You finally landed at a beautiful castle just outside of town. Of course you know it belongs to none other than Twilight Sparkle, the Princess of Friendship.

"I have to say this is quite convenient. I was kind of hoping to see Twilight while I'm here." You said trying to hide your adoration for the intellectual Alicorn.

You then muttered a quick incantation to teleport yourself inside the crystalline castle. Immediately, you found yourself floating in Twilight's bedroom and fortunately for you, the princess was on her bed with all of her attention onto a book she's reading.

You cautiously floated closer to her, pleased to see that she was laying in a position that has every orifice of her body, excluding her mouth, out in the open.

"Hello, Twilight," You whispered to her even though you believe there's no chance of her hearing you at your current size. "I really hope you don't mind if I go exploring inside your body a little."

Which orifice do you decide to use to enter Twilight's body?