You let her fuck you

You hang your head.

"Okay. You're my girlfriend, so... Let's have some fun?" you try to smile at her but your heart isn't in it. She doesn't seem to notice.

"Yes! Oh my god, babe. Come here. Kiss my cock then I'll give you the best dicking you've ever had."

You get on all fours and crawl over to her waiting python. You lean down and kiss her dick, right on the slit.

"To be honest, this will be the first dicking I've ever had. Girls like you are very rare."

She nods, reminded of how abnormal she is considered to be. But she loves what you just did for her and pats you on the head.

"Don't worry, I'll be gentle. Get on your back, legs up. I want you to see me when I enter you... By the way, where's your lube?"

"I keep some in the bedside drawer for... Well, alone times..."

She chuckles as she fishes it out. "Someone likes to **** the chicken. This will feel so much better, baby. All you'll ever want is my cock."

She slicks up her hands and then prods at your asshole. It's cold. It's the middle of the night and you can't believe what's happening to you. She slowly inserts one finger after another, loosening you up.

"How does it feel?"

"It feels weird... It hurts a little when you stretch me. I don't know if I'll be able to take you all in one go, but I promise I'll try."

"I believe you. You seem honest, baby. I like that. Now let me repay you for being so nice to me."

She pours lube up and down her dick. There's so much cockmeat in her hands it takes the rest of the bottle just to get it covered. She chucks the empty bottle away onto your floor and scoots closer to your raised ass on the bed.

"Relax," she says. "I'll press against you. Just breathe. It'll come when it's ready."

Her cock must be a foot long but you thank God that it's not too thick. You didn't want her cock to kill you after finally convincing her to drop the knife. You feel her slippery head push against your lubed up hole. You breathe and stare into her face. At first nothing seems to be happening, but then you feel it. With every slow breath a little bit more of your anus gives way. Then her full thickness slips inside of you and you gasp.

"Oh yeah!" she says. "That's the stuff! Oh my god!"

You're being filled from below. It burns but her dick grinds against you, scratching an itch you never knew you had. You're panting again, but not out of fear anymore.

"I feel really weird, Aiko. Weird, but good. Keep going."

She looks so happy.

"I'm going to be the best girlfriend you'll ever have. The only girlfriend you'll ever need. I'll fill you up every day. I don't know if I can get you pregnant, but I'll try."

You'd laugh but your dick has stirred to life. The pressure you're feeling has activated something deep within you. It's getting harder to think.

"I'll be your boyfriend. I'll make you feel good. Oh god, you're so big. Don't stop..."

She picks up the pace and starts thrusting into you. Both of you are breathing heavily.

"Aiko... I'm not used to this... I can feel it, I'm going to cum!"

"Me too! Cum for me, baby! Milk my dick with your asshole!"

You surge over the edge. Your orgasm is stronger than anything you'd experienced just masturbating. It ripples from the inside out, and wracks your body with pleasure. Your ass clenches onto Aiko's monster like a vice and soon she's cumming into you as well. Her seed flooding into you is white-hot, and fills you with a lewd warmth.

Eventually it comes to an end, and Aiko collapses on top of you. Her cock is still stuffed deep inside you. She kisses you again and again. This time you kiss her back, and your tongues wrestle with one another.

"You can sleep with me tonight, Aiko."

"What if your mother finds out?" she asks.

"You're my girlfriend, remember? I'll just tell her the truth."

"Yeah," she sighs. "I'd like that..."