She knelt on the bed with her face down and her ass up, cheeks spread wide by her own hands. "Do it," she said, voice hoarse. "Put your cock in my ass. I want to feel it stretch me open for the first time."
I stood behind her, cock already slick with lube and spit, throbbing hard. Her asshole looked tight, pink, untouched. I pressed the fat head right against it and pushed. Nothing gave at first. Then the ring started to open, slow and stubborn, gripping me like it didn't want to let go.
"Fuck, it's tight," I grunted, leaning in. "Your asshole is fighting every inch."
She pushed back a little, breathing hard. "Keep going. Don't stop. I need it all the way in."
I gave her another inch. The head popped past the tightest part and her hole clenched around the shaft. She let out a low, dirty moan. I held still, letting her feel the thickness filling her. Her ass was hot inside, squeezing rhythmically like it was trying to push me out and pull me deeper at the same time.
"Goddamn, look at that," I said. "Your little asshole is swallowing my cock. First time and it's already greedy."
I pulled back just a bit, watching her rim stretch around me, then sank in another inch. She was panting now, fingers digging into the sheets. I reached under her and found her pussy soaked, dripping down her thighs. Two fingers slid right into her cunt while I worked my cock deeper into her ass.
"You're dripping wet from getting your ass fucked," I told her. "You like it, don't you? Say it."
"Yes," she gasped. "I like your cock in my ass. It hurts but it feels so fucking full. Give me more."
I pushed harder. Half my length was inside her now, her hole stretched wide and shiny with lube. Every time I rocked forward her ass cheeks jiggled and her rim clung to my shaft. I started a slow, steady thrust, not pulling out much, just grinding deeper each time.

Her asshole made wet, obscene sounds around me.
"Listen to that," I said. "Your ass is making filthy noises while I fuck it. First time and you're already taking it like a slut."
She moaned louder, pushing back to meet me. I gave her the rest in one steady push until my balls pressed against her pussy. Buried to the hilt. Her ass was completely stuffed, stretched tight around the base of my cock. She shook, breathing in short bursts.
"Holy fuck," she whispered. "It's all the way in. I can feel you in my guts."
I stayed deep and ground my hips in circles, stirring her ass with my cock. Then I started fucking her properly, pulling out until just the head stayed inside and driving back in. Each thrust made her asshole gape a little before it sucked me back in. I slapped her ass cheek hard and watched it redden.
"Take it," I growled. "Take every inch in that virgin hole. I'm going to fuck it until you can't walk straight."
She reached back with one hand and spread herself wider for me. "Harder. Fuck my ass harder. I want to feel it tomorrow."
I picked up the pace, slamming into her. The bed creaked. Her ass rippled with every thrust. I could see her stretched rim gripping and releasing my cock, shiny with lube. Her pussy kept dripping, a string of wetness hanging down. I reached around and rubbed her clit fast while I pounded her ass.
She came hard, ass clenching and pulsing around my cock, whole body shaking. I didn't stop. I kept fucking through her orgasm, using her tight hole like it was made for it. When she started pushing back again I knew she wanted more.
"Fill it," she begged. "Come in my ass. I want to feel you shoot inside me the first time you fuck it."
I grabbed her hips and drove deep, holding there as I unloaded. Thick ropes of cum pumped straight into her ass, pulse after pulse. I stayed buried while I finished, letting every drop stay inside her. When I finally pulled out her asshole stayed open for a second, pink and used, before slowly closing. A thick trickle of cum leaked out and ran down over her pussy.
She collapsed forward, breathing ragged, ass still twitching. I watched my cum drip from her freshly fucked hole and knew we'd be doing it again soon.