Another side at the vet help

After several days of Bella getting fucked by me 2-3 times a day and only having Russ watch. But Russ and I kept DP'ing Daisy the Great Dane every afternoon. It was Daisy's last day with us. As her owner was coming to pick her up today.
After I finished fucking Bella I laid silent while Bella cleaned my cock. I was listening to hear Russ getting Daisy out of her kennel.
I heard her whimpering and I knew he had her in his room.
I allowed Bella a few more licks of her daddy's cock then I walked down to Russ who was already giving Daisy's pussy a good fucking.
He was sitting in the chair, Daisy was belly to belly with him. I had a wonderful view of his cock buried deep in her pussy.
Russ smiled when he heard me.
"Come on my friend. This bitch leaves today and I want to enjoy her one more time. " he said as he reached down and pulled Daisy's tail up.
Russ had her pussy stretched tight again. I watched as his cock slid in and out covered in dog pussy juice.
As I continued to watch my cock was getting hard. But then Russ slipped his finger into her asshole.
He smiled and winked at me.
I was fully hard now. Watching Russ share his kink with me was such a turn on.
I spat on my hand and rubbed the head of my cock. Then pushed the head of my cock into the asshole of Daisy. Russ kept his fingers inside her asshole while pumped her. He and I were in rhythm as we both went balls deep. Daisy whimpered. We kept thrusting in her.
Russ locked his legs around mine which caused my cock to throb. There was something about his touch.
I braced my hands on Daisy's back and started thrusting harder.
Russ smiled. He placed his hands on mine and I felt him thrusting harder. Our fingers touching on her back and only a thin membrane separating our cocks as we both fucked this bitch.
I felt my balls tighten and I knew I was about to cum. I moaned. "Fuck Russ I'm coming man. I'm fucking coming".
I ground feel feeling Daisy's body ripple as her ass got flooded with my cum.
Russ grunted and then he moaned. I could feel his cock throbbing in her pussy. Each throb he flooded her pussy with his cum.
Russ and I were both breathless.
Russ was still feel in her pussy as my cock slipped from her ass. My cum ran from her now loose asshole. My cum dripped onto Russ's balls. He groaned as he moved his hand back to her loose asshole.
His fingers dipped in my river of cum and Russ whispered "damn man you are one sexy fuck".
I smiled as I stepped back.
He turned Daisy loose and she started licking his cum off his cock.
"I'm gonna miss this bitch"he said.
I smiled and said "there's always another to take her place" .