I fuck Millie in the ass

Millie feels my cock pushing past her sphincter, and she tries desperately to clench it shut, but this only heightens my sensation of pleasure as the tip of my dick pushes into her ass.

Having pushed the entire mushroom of my dick into her ass, I feel her sphincter tightening around the shaft of my dick behind the mushroom, securing it in her ass. Millie's ass is convulsing as she tries to use her ass muscles to push the intruder out of her anus, and she starts bucking her body up and down, so I put my hands on her ass cheeks to keep her still so my dick does not shake out of her ass.

I hear Millie breathing intensively, almost like the shock of my dick spreading open her anus is causing her to hyperventilate, so I leave my dick where it is for a while, then I slowly push it in about an inch, then slide it out, then slowly push it back in again, giving her a chance to adjust.

Millie's breathing is starting to slow down, so I slowly push my dick in as far as I have before, but instead of stopping where I previously stopped, I continue to push deeper into her ass. Millie whimpers with the pain this causes her, and she tries to move her body away, but she cannot escape being wedged in the basement window, so my dick continues to relentlessly push into Millie's ass.

"No, no, no, no!" Millie whispers as my dick reaches as far into her ass that is possible, her sphincter convulsing as it tries to push the intruder out, but this only has the effect of sucking my dick deeper into her ass.

My dick is now all the way to the hilt in Millie's ass, and I hold still there for a while, as Millie whimpers with pain. Then, slowly, I slide my dick out of her ass, and I feel Millie's body relaxing as the intruder withdraws from her ass. I withdraw until only the head of my dick remains in her ass, then I push back in slowly, and Millie's body tenses again as her ass is being stretched.

I slide my dick out of Millie's ass slowly again, leaving only the tip in, then I slowly start to push forward, and I feel Millie take a deep breath to prepare for what is coming, but then I slide my dick out again so that only the tip is in her ass. Again I start pushing into Millie's ass, and again she takes a deep breath and her body tenses, but then again I slide my dick back.

I pause for a while, Millie is breathing heavily, and I can tell she is does not know what is coming next. Then, without warning, with one massive thrust I plunge my dick all the way to the hilt into Millie's ass.

Millie screams out in shock at the shock and sudden pain of her ass being stretched like this, but I ignore her and rapidly pull my dick back out, then thrust it back in all the way to the hilt.

"No! Please! No!" Millie whimpers, but I keep thrusting my dick into her ass at a higher and higher pace, ignoring her pleas to stop, until I release my cum into her ass.