Keep very very still, bite down on your lips and close your eyes

From Create Your Own Story

When he pushes in, you grab on the metal headboard bar with all your strength to keep yourself very very still.

Then you bite down on your lips and close your eyes as hard as you can, thus only allows a small yelp escape your mouth.
You remember you have to be brave to be a big girl. So despite the pain makes your eyes moisten, you keep yourself from crying out.

With the thick head of Josh's lolly inside you. He stopped for a moment to allow you to get used to the feel of him inside you.

You try to have one eye open to see what's Josh doing and still have one eye screwed up from the pain. Josh's lolly is huge for your little kitty even with only a head in.
You managed to say. "Josh, I feel the head of it inside me." You can see Josh closes his eyes for a moment and an expression of pleasure shows on his face.

'Oh yes, you are so tight, Mira' Josh let out of groan as he enjoys your extremely tight kitty.

'Now, Mira. Next bit got hurt a little more. I can feel your little 'hymen' resisting me. It is like the seal on a milk bottle. We have to open it to make you a big girl.'
Josh talks to me then proceeded to gently increase the pressure of his penetration, you can feel the tip of his lolly, it must be the 'hymen' he is talking about.

You are too focused to endure the pain. So you just nod a little and hold even tighter on the headboard bar.

'Mira, think this as the doctor is giving you an injection, just with a big needle. You are always brave when doctors do that, right? Maybe you want me do this part fast so it only hurt for a short moment, right?' Josh says.

You nod with tears in your eyes.

Positioning himself a little forward, Josh grabs your tiny waist and holds you tightly, then dives into you, slamming his 'needle' all the way in.

'Ahhhhhhhhhhhhhhhhh!". You can't help it but make a loud yelp as the 'needle' is so thick and it filled your kitty like nothing ever before stretching the soft inner wall to a point when you spontaneously contract your kitty clinging even tighter on the 'needle'.

'Are you OK, Mira?' Josh stopped for a moment, as his 'needle' is completely inside you, submerged in your tiny little body, its tip is probably at where your abdomen is.

'Yeees, I..I am ok.' You try to speak but with a whimper. As you lean up your elbows seeing where you two connect, there is quite a bit of blood down there on both you and Josh's groin, your thighs, and the bed.

'Josh, I am scared, I am bleeding, should I see a doctor?' You ask your brother.

'It's fine Mira, blood is normal when you transform into a big girl. You are my brave little sister, right? Big girls don't afraid of blood.'

'I..I am a big girl now. I am not afraid.' You sound really soft, but you want to be the bravest big girl.

'Yes, you are a big girl now. But not just yet. Not until I put gloop inside you.'Josh says.

'Ok, Josh. I am ready. Put your gloop inside me.'

'Yes, Mira. You are my sweetest little girl. Let brother feel more of your soft body.'

Josh presses himself onto you. He wraps his arms behind your back and holds you tightly, now you can feel his full 65kg weight.

You can't help, but to start gasping heavily. After all, your 20kg tiny body have to endure all this.

Josh began sliding his cock within you, pumping you gently at first to get you accustomed to the feel of him, "You feel incredible, Mira," Josh tell you.
"Your kitty is so tight and so hot inside. I can feel your heat. Sweetheart. I LOVE fucking you Mira. Fucking my sweet, beautiful virgin sister, so much pleasure. Brother feels so good."

You let go of your arms from the headboard bar and wrap them around Josh's neck, so you don't have to fight his rhythm.
Josh immediately lean his head down and put his mouth on yours then start kissing you passionately.
You are having trouble to breathe. Almost feel like you are about to suffocate as his tongue reaches inside your mouth like he wants to eat you up like an ice cream.

With each of his stroke, the pain persists, but a tingling sensation starts to pulse from inside your kitty to your whole body even to your fingertips.
You start to feel warm and strangely..a feeling of pleasure. And it starts to grow stronger and stronger. With both the pain and pleasure, you don't know whether you should cry or smile.
So you feel like to do both, a little smile appears on your face while you still having tears dropping from your eyes.
You try to make a sound, but with Josh's tongue stirring in your mouth, it really sounds like a little kitten meowing with a whimper.

Josh begins to penetrate you with increasing intensity, his groans and gasps become louder and more urgent as he thrust his lolly in and out of your little kitty with greater energy and power.
He went deeper and harder each time he moves.

You move your face away from his mouth trying to catch a breath, while doing so, you also get a peak at his lolly as it grows so big. It is red and shiny covered in your blood and his gloop.
Since you are so small and thin, each time he moves in you, his lolly prop your belly up a little bit. It is like a big monster trying to stir you and shred you apart from inside.
But you are becoming a big girl now. So you must be brave.

"Josh, you are happy, right? That I am becoming a big girl." You ask.

"Yes Mira, I am really happy. Part of becoming a big girl is to make your brother happy. And you are doing really well. But if you move as well, you will be the best big girl in the world ever!" Josh says.

"Ok." You heard you brother and you want to be the best big girl ever. So you wrap you little legs around his waist and start grinding your kitty against him.