I think she knows

You smile at her, moving your hand to cup her nice big butt cheek, giving it a nice squeeze.

She smiled, returning the favour to your own plush ass before turning to walk back to her house. You stop her, telling her you can’t wait

“But...”she said, turning a beet red, “people can see us...”

You smiled and bent her over a nearby fence. You pause to take a look at your prize. Leaf’s skirt was so scandalously short it could be mistaken for a belt. The bottoms of her enormous rump greeted anyone who happened to be behind her when she wasn’t standing straight up. Bent over the fence, her full glory was on display, easily the nicest ass you’ve ever seen.

“I know it’s big, stop staring” Leaf said “I get enough of my brother slapping it and my daddy using it to relive himself. Even my mother spanks it as she walks by!”

You can see how both embarrassed and turned on she is. The microscopic “underwear” she has on is visibly straining at her wide birthing hips, just barely covering her hairless mound, before disappearing into her titanic bottom. Your cock is starting to strain your own panties, threatening to rip through them and burst out.

Leaf finally says, “well? Aren’t you going to do something?”

Your response is the dropping of your panties.

Your massive rod springs to attention, her goddess like butt making you so hard the head of your dick sits between your breasts. You would titfuck yourself like usual, but there’s a better option now.

She is in awe, her eyes as big as dinnerplates. “You’re a futanari?! And you’re so big!”

While some futa’s, like your older sister, had to prove themselves futas by revealing their breeding hole behind those fucksticks, your MM size tits never gave anyone doubt you were female. You readied your cock at her opening, before she started to beg you.

“Please, please , please not my cunt. I CAN’T get pregnant now. I have a whole journey ahead of me!”

You nodded, knowing full well what that felt like. Instead you rested your massive prick between her checks, slowly fucking her buttcheeks. She moaned, saying that the amount of sexualization put on her ass basically made it a sex organ. You slapped it, and watched as the globes of flesh jiggle, your slut crying out in pleasure. You take her pantues fully off and start stroking her baby making hole with your cock. Once slick with her own juices, you go back to hotdogging her.

She can’t take it anymore, screaming, “TAKE ME. SHOVE THAT THING IN MY SLUTTY ASS. MAKE ME YOUR ANAL WHORE. JUST PLEASE FILL ME. STRETCH IT OUT UNTIL I CAN’T WALK STRAIGHT”, drawing attention to the two of you.

You smile and line up, burying the first 7 inches deep in her ass. She cries out in orgasm, and rocks back on you, trying to take the rest of it. Little did she know, she isn’t even halfway there. Her butthole is painfully stretched, and you thrust in harder, managing all but 3 inches, making her cry out a second time in orgasm. You slap her ass as you pound your penis into her anus, people gathering to watch you two.

Men are stroking themselves out openly while the women are fingering themselves with vigour at your hot act. You feel a bubbling sensation, and reach around to pinch her nipples and cup her smallish breasts. You whisper, “cumming” softly, causing a shriek of “YESS. YESS. FILL MY ASS. MAKE ME YOURS”

So you do. You pump more and more cum into her bowels, visibly distending her stomach. She groans and holds her ass, but you’re not done. You flip her over and put your shaft between her tits. They’re not nearly large enough to envelop your huge duck, but they feel good nonetheless. She sucks at your head while you squeeze her massive butt with one hand and finger your own pussy with the other. You tell her you’re about to cum, but she has other plans.

“BREED ME” she screams. “FILL MY PUSSY WITH YOUR FUTA SEED. MAKE ME BEAR YOUR FUTANARI CHILD SO THEY MAY PUT ANOTHER IN ME TOO”

You oblige, sticking your length into her virgin cunt, filling her womb. She cries in ecstasy, going limp. You pick her up, moving through the public masturbation scene you’ve caused, carrying her back to her house where you lay her in her bed. Her brother winks at you and her mother asks whether she was a good lay. You smile and nod, and open her drawers. You find an absolutely massive dildo, which explains how she was able to fuck you with such skill. You ease it into her ass and pull the covers over her, leaving the note, “thank you. When you birth my child, let me come back for you. We can be together, and I can put another in you”