Take her up on the second offer
From Create Your Own Story
"I want to fuck you in the ass," you say, struggling to keep from cumming at the mere thought of burying yourself in that tight backdoor. She nods, getting to her feet.
"We don't have any lube," she says. "So you're going to have to be gentle." She raises her finger just and inch from her mouth and spits on her hand. The hand falls between her ass cheeks, and you watch as she swirls the spit between them.
She spits on the fingers again, then buries a single finger right up her own little asshole. "Use lots of spit," she says, turning and bending over. "I haven't really done this with a guy, so please don't hurt me." You spit down on her asshole as she bends over before you.
"You've never done this before?" You ask, positioning your cock against her little pink knot.
"Only with a dildo," she says. "It helps me cum harder." You squeeze the cheeks of her ass and give your hips a push forward. You nearly bend in half, and have to reach down to grab hold of your shaft. Now, with cock in hand, you push forward again, spreading open her tight little butthole just enough to get the very tip in.
She groans, then hisses. "Fuck, you're so big. Be easy. Easy." You open your mouth and let a string of drool fall on the head of your cock, then push in just a tiny bit further. Her body tenses, but she reaches between her legs to play with herself.
"Okay," she whispers. "Okay, a little more. I can take it." You push again, and the entire head of your cock pops right into her asshole. She lurches forward, groaning again. "Oh, fuckkkkk. Oh fuck. You're so big."
"You're a dirty girl," you say, pushing just a little further into her. She nods her head, gasping.
"I am," she says. "I am a dirty girl." Then she rocks her hips a little, her asshole pulsing around your cock, milking you. You slide in just a bit further, the muscles of her sphincter so tight around you it almost hurts. "I'm a bad, dirty girl for you." She looks back over her shoulder, eyes meeting yours, and she offers you a tiny smile. "You hurt, but you hurt soooo good. You can go in deeper. Just not too fast."
You push a little further, and her body finally gives in to you. Neither of you intend it, but her big round ass sucks you in fully now, taking you down to the hilt. Her heads rolls back on her shoulders, and she lets out a squeal that sounds like a wounded animal. "Ohhhhhh myyyy godddd...." she says. "You're so deep in my ass, baby."
You try to pull free just a bit, but the sucking of her cavity pulls you back in. "Fuck yes!" She cries, pushing her hips against her, her hand working faster and faster at her dripping wet pussy. "I'm going to cum!" She says. "Don't stop! Cum in my ass! Fuck my big ass and cum deep inside of it!'
That's all it takes. The tensing of her body and muscles and those dirty words send you over the edge. You cum rivers into her bowels, twitching and fighting to keep your knees from buckling as her ridiculously tight back door milks you of your seed.
Finally, she slowly pulls free of you, then collapses onto the couch. "Holy fuck, that was great. My ass feels like it's been split in two, but that was the best orgasm I think I've ever had."
You can't help but feel partial agreement. That was the greatest orgasm of your life.
You nestle up with her on the bedroll, drifting off to sleep. During the night, the infection takes hold, and the two of you awaken without a conscious mind. You're both blister covered, and your only thoughts are of violence and violent sex. Locked together in the vault, you commence to getting down to both, with each other.
It's not a pretty end. For either of you.
