She lets her join

"Sure! That sounds fun!" Hino said as Sarah gawked as her brother did a double take staring at her like she had just kicked a puppy as she gave him a smirk.
"What's the matter? What kind of big bro doesn't want to take care of his little sister man?"
"She is my sister! My literal sister! Why would I want to sleep with her!? I saw her as a baby! I helped change her I do not find her sexy-"
"You don't think I am sexy!? Have you looked at me!"
"I have! You are the same child I saw cry when I forgot to leave her lights on!"
"I did not cry!"
"You cried for a full minute before I calmed you down!"
"That is not-"
"Ok! I get it! Both of you love each other! How about less talking and more fucking? I would really want a spit roast, so what do you say? Team up?" She asked as Sarah paused staring at the two before she sighed and began to take off her clothes.
"Yeah sure, why not, but I want a turn on his ass ok?"
"That's fine with me! Maybe we can see who bred him!"
"You two are not serious, this is not what I thought you would be doing-" He did not get a lot out after instead he was suddenly pushed, adjusted and in some cases quite literally folded like a piece of paper before he was looking at his younger sister's massive pale cock. For a moment he stared in shock just how large she had grown. She was not a little kid anymore, she was a young adult and she was packing heat, she was not as large as Hino, though futa cocks but then again, she had finished becoming an adult, and if biology class was right futa cocks would continually grow once they hit proper maturity, something she had been hit by with a truck, If that was anything to go by she was going to at least be as big as Hino and for a moment his jaw fell open wondering just where she hid her cock most days.
"It's huge." Sarah said as she smirked, her brother's jaw was still gaped as she took the chance to slam her hips inward. Forcing her cock into his soft and silky throat as Hino **** her cock into his ass, both futas spit roasting the mocha femboy as he squealed onto their cocks. Pain and pleasure mixing together as he sucked and gripped down harder and harder as he was filled up on both ends. Both futas wasted no time in quickly finding a rhythm in pounding forward, slamming their heavy childbearing hips forward. Hino's massive brown cock began to **** and obliterate his prostate. Making him feel shockwaves of pleasure along with jolts of pain as her dick stretched his ass out in ways that no ass ever should. His ass was pulled apart as his jaw was stretched wide open making him scream in pain and discomfort the pain of his jaw only outweighed by the intense tidal waves of bliss coming from his ass as Hino made sure to grind down onto his prostate doing her best to maximize his pleasure as she ground her dick down and slammed her heavy mushroom tip forward and punched and pummeled his ass. Forcing her dick head right into his boi womb slamming it forward as she began to hammer away at his ass! The heavy clapping of flesh slapping flesh began to fill the air with sordid, wet and lewd slapping sounds as she got to the real bussy breaking of the evening, her hips moving in almost a blur her balls clapping down hard against his. Her massive futa balls crashing into his tiny male ones as Sarha's thick heavy cum factories smacked up into the bottom of his chin as both futas railed him without mercy! They slammed in and out faster and faster driving their cocks into his holes again and again! The futas fucked as hard and as fast as they could but they could not last as long as either of them would want, the feeling of his tight holes gripping down harder and harder onto their cocks as both holes gripped down hard onto their dicks milking them like a professional whore as they felt like their cocks were melting inside of them! Both of them felt their balls twitch before the twenty-minute mark and five minutes later both finished inside of him Hino flooding his ass and Sarah his stomach, both filling him up with a gallon of cement like futa spunk each as they groaned.
"Switch?" Sarah gasped panting as Hino nodded.
"Fuck, I'm in." She hissed as both futas began to switch holes not caring for the near broken bloated femboy best friend slash brother to them as they went to the other hole and once more began to fuck his tight body, Hino stretching his jaw and Sarah breaking his ass as they once more began to fuck his holes into submission! As he squealed and whimpered! The futas grunting as they groaned.