Without mercy

As she pushes the fake cock against his tight entrance she feels strong resistance at first and Adam begins to moan at the attempted intrusion. Opting not to bother with any proper anal warm up for Adam, she grabs both of his ass cheeks with her hands and forces them apart, causing his ass to stretch slightly more giving her a bigger target to aim her plastic cock at. eventually she is able thanks to the lube and the amount of brute **** she was using she eventually forces the plastic head past the entrance to his ass.

"ah fuck"

Adam moans as the cock head enters his ass

"Something to say slut?"

She said confrontation-ally, waiting on him moaning or complaining for the opportunity to answer his pleas with a quick thrust up his virgin hole. Contrary to what she expected Adam is in a state of bliss, feeling his tight hole being stretched by the large, fake cock he felt hornier and more satisfied than he ever had done in those countless nights spent jacking off to the sexy bimbos. That's when he realized, he had never fantasied about fucking one of those bimbos he had instead fantasied about being one of them. This was his purpose, it had to be, it felt so good, so right. So instead of begging her to stop he shouted out:

"YES! YES! Fuck my tight ass!"

For once his sister followed his instructions and rammed the fake cock hard into his ass, she keeps a hold on his ass and uses her nails on it roughly, gouging his already sore rear and with a single thrust she reaches the bottom of the strap-on. She then completely removes the plastic cock from his now violated hole and then swiftly rams it right back in with no resistance from Adam. Adam who by this point is in stupid slut heaven, feels his cock well up as his mistress continues to piston into his hole from behind. After only five minutes of brutal ass fucking his now shrinking cock shoots its load all over the bed, gallons of the stuff, more than he had ever produced previously combined. Upon seeing the cum streaming from her brother she laughs and instead of slowing down picks up the pace even more, until every last drop had left his balls then one last time she thrusts balls deep into his ass. She then unstraps herself leaving the fake cock buried deep in the previously virgin ass and selects a but plug from her collection of toys. She then moves back over to Adam and withdraws the cock from his ass with a plop and in its place, she immediately puts the but plug. Giving Adam's ass no time to close up the gape that the strap-on had left. Adam gasps at this new intrusion and feeling in his ass but once again surprises his sister by refusing to complain about his treatment.

"There we go"

She says patting his rear, causing the but plug to move a little inside him.

"That hole is far too tight for a cheap slut from now on you'll be plugged constantly so you'll always be ready for a nice big dick. Now you need to clean up this mess you made"