New discoveries

As Amy sank slowly downwards, the entrance to her pussy began to stretch wider and wider.

"Fuck! It feels like you are tearing me in half!" She hissed.

"...and my head isn't even in yet..."

"What?! Fuck! No way! How far...?"

"Oh, I'd say you have the better part of two inches to go until you are clear...You want some help?" Sarah said with amusement as she watched Amy try to **** herself down onto Sarah's massive girlcock.

"Fuck you. I got this," Amy said as she continued to struggle.

"Oh really...well, I gotta say is that I sure am enjoying watching you try, but all you need to do is ask..."

"Fuck! Fine! I need this fucking cock inside me. So, bitch, help me out?"

"Never thought you'd ask, sweetheart" Sarah said as she reached up to place her hands on Amy's hips.

She tightened her muscles in her upper body, and with one powerful push from her newly enhanced muscles Sarah shoved almost half of her cock into Amy's tight cunt.

They had been trying to be a bit more quiet than usual because Adam was in the house, but the sudden invasion of her pussy by Sarah's enormous rod made Amy scream out in both pain and pleasure.

It seemed like only seconds later that the door flew open.

"I heard a scream. Is someone hurt...?" Adam stopped, completely stunned. There on the bed before him was Amy with the thickest cock he had ever seen shoved deep into her over-stretched pussy. And that cock belonged to his...sister?!

"Oh, hey Adam," Sarah said as she effortlessly lifted Amy up and up and up, until the tip of her massive member hovered at Amy's entrance. Then she dropped her back down. Amy screamed out again.

Adam could not believe what he was seeing. His sister was seriously fucking jacked and had a cock four times longer than his and as thick around as his forearm?! How?!? When did this happen? She wasn't like this before...I mean, he had just seen her in the shower, hadn't he...?

"I had been hoping to have Amy here flirt with you a bit and get you in a compromising position so I could humiliate you, but I guess this works too," Sarah continued while she continued to piston Amy up and down the length of her impossibly huge futa cock, shoving her down deeper with each thrust.

"Why don't you drop the shorts and show Amy here what you are working with 'big' bro; who knows, maybe she will give you some head..." Sarah said with a chuckle.

"Yeah. Come here 'big' boy. If your sister is any indication, you've gotta be packing some serious meat, right?" Amy struggled to say to him, although she did say it with a smile.

She reached over and grabbed the waistband to his athletic shorts. For whatever reason, despite knowing he should have left, he didn't resist as Amy pulled him closer and dropped his shorts and boxers.

She laughed.

"Really?! That's what you are working with?!! How small is that thing?! Your *sister* has a cock like ten times that size!"

Sarah took that moment to lift Amy up off her cock and then shove her all the way down its length. Amy's pussy let out a massive quiff followed by a fountain as she started squirting uncontrollably.

"Adam, if you want, you can stay and watch as I fuck Amy here into oblivion, you pathetic cuck, but know this: I will break you if you go telling anyone about me just yet." Sarah told her shamed brother with a wicked smile.

Adam for his part, just sank down by the door as he watched his dominant sister continue to fuck Amy--his former crush--from one mindblowing orgasm to the next...