Breaking her in (1)

My brother's girlfriend, Laurie, is such a bitch. Atually, I wish she was really a bitch, enought to fuck him.

One day I'm at home and she enters my room. She says she always hears sounds of pleasure coming from my room, so she knows I'm good at treating the ladies. I agree, and ask what does she want.
She says she's a virgin, and that she's afraid of having sex with my brother since she found out he has a big dick.
I laugh and say "yeah, it runs in the family, do you want me to break you in?"
She smirks and says "yeah, but not the way you might be thinking of"
Before I can say anything she hugs me, I feel a weird shock and pass out.

When I come to things few weird. I feel smaller and chubby. I try to get up and see my own body, naked and rubbing one out.
"It's me, Laurie. If you think this is weird, look down"
I do and have the shock of my life. I'm sporting tits!
"You are in my body and I'm in yours. You didn't lie about your penis huh! I'll enjoy this with your girlfriend" and she laughs.
I start to panic. She notices this and comes up to me. My dick looks huge from her point of view! I feel it touching my navel.

She holds my wrists and says:
"Here's the deal. You're going to go over your brother's room, lose my virginity for me and give him a good time this weekend. You must know how to do that, you enjoyed many of those as I heard. While you're there, I'll be in your body, learning a thing or two about the male body with your girlfriend. If you do it right, I'll return you to your body tomorrow by night. If you try to tell anyone about this swap, you better get used to seeing your dick from that perspective".
I feel my stomach twisting. I say "Please don't make me do this! My brother's dick is huge!"
She smiles "Yes it is! And you're going to take it all in tonight, otherwise you can expect to take it in for the rest of your life. We're stuck for at least 12 hours".
I feel my legs trembling. I gulp and go to my brother's room.
He's sleeping naked. God, his dick is enormous! Even bigger than mine!
I get next to him while looking at it. I have to fuck this one if I want mine back.
I take it in my small hands and start masturbating him. He wakes up.

"That's what I was talking about baby! I'm glad you finally accepted doing this! You won't regret it, I promise".
I kiss his dick and notice it barely fits in my mouth. I start trying to put it in my mouth anyway.

While I'm sucking it I can hear my girlfriend's moans coming from my room.
My brother smiles and says "See? My bro is good at it, it runs in the family. You'll be moaning like that in no time". I try to smile but it's really hard. Just like his big dick. And the worst part is that I can feel some kind of dampness forming between my legs.

While that happens Laurie is fucking his girlfriend and thinking "Oh I forgot to warn him about cumming! If he gets my body pregnant he's stuck like that! I should go there offer a condom but...this pussy is so tight!
I'll go there later, I'll bet it will take him hours just to touch his brother's dick anyway..."