I fuck Patti in the ass

Patti's whole body tenses when she feels my cock touching her anal entrance. Millie rubs Patti's ass cheeks, and says: "Relax." I look down at Millie, Millie looks back at me and nods, and I push my dick into Patti's ass.

As my dick enters Patti's ass, she clenches her hands into fists and grits her teeth, she is really struggling to accommodate my dick in her ass. I keep pushing though, and finally my dick is all the way in Patti's ass. Patti's face has gone almost completely red, and she is panting heavily, her ass must be hurting terribly.

I look over at Millie, and Millie starts massaging Patti's back, then leans forwards and whispers:

"Relax." In Patti's ear.

Millie then looks back at me and nods, and I very gently start fucking Patti in the ass. Patti keeps her eyes tightly shut, her hands clenched into fists, and her breathing is like panting. Patti's ass is hugging my cock tightly, her body is not relaxed at all, so pushing in and out of her ass is difficult, but the pleasure is immense.

I let out a groan of pleasure, and Millie looks at me with a smile and says:

"You like my sister's tight ass?"

I smile and nod.

Millie turns to Patti and asks:

"How does that dick feel in your ass?"

"It hurts terribly." Patti says between gritted teeth.

Millie keeps rubbing Patti's back, while I slowly slide my dick in and out of Patti's ass. Then Millie slides her hand under Patti and starts rubbing her pussy.

Patti flinches a bit and asks:

"What are you doing?"

"Am trying to help you relax." Millie answers.

Millie keeps rubbing Patti's pussy for a while, and I can feel Patti starting to relax more and more, then Millie shifts position and kneels behind us, watching my cock slide in and out of Patti's ass, and says:

"Wow, this looks amazing from back here."

Millie stands up, pushes her tits against my back, her arms reaching over my chest, saying:

"How does my sister's ass feel like."

"Tight." I whisper, while groaning from pleasure.

"You want me to get him to cum?" Millie asks Patti.

"Please." Patti whimpers.

Millie drops down to her knees behind me and starts licking my balls from behind. This, in combination with Patti's tight ass gripping my cock, gives me amazing pleasure. I don't want to cum, so I slow down the pace I am using to fuck Patti in the ass, but it is not to any use, soon my cum is shooting into the depths of Patti's tight ass.