Babysitter Billy has company

One day while at Billy's he had a friend staying with him. Her name was Tina. Tina was very pretty. She had big tits (this was a word that Billy taught me to say instead of boobies)
She didn't dress like anyone I had known. I could see her tits and nipples through her shirts. I could see that she didn't like to wear shorts or pants as she was wearing panties.
Katie was sitting on the couch next to me, she was eating ice cream.
Billy whispered that he was going to show Tina the cool things that Katie did.
I asked if I could watch too. He smiled and said if course we'll make it a game.
That had me happy. I loved games.
Once Katie started to yawn. Billy walked over and took her bowl and gave her the pacifier.
He motioned for me to slide closer. He lifted Katie and placed her head in my lap. Billy then pulled my penis out and started rubbing it getting me hard.
Tina gasped and covered her mouth. Billy pulled Tina to sit next to me.
I was so proud. When Billy took her pacifier out of her mouth and pushed her mouth onto my penis and she stated sucking me. I looked at Billy who gave me a thumbs up.
Tina sat in silence watching Katie suck my hard penis.
Billy then pulled Tina up and he sat down. He pulled Tina's head onto his lap and he started rubbing his penis getting it hard. Tina looked shocked but she gave in after Billy pulled her head down to his penis.
Tina started sucking his penis like Katie was sucking mine.
Billy's penis was much bigger than mine and Tina was much sloppier than Katie. But I was proud nonetheless.
After a few minutes of Katie sucking my penis I watched Billy pull Tina's tit out of her shirt. Her tit was bigger than my mom's, who was the only one is actuality seen in real life.
Tina moaned as Billy squeezed her nipple and she sucked harder on his penis.
I moved my hand to Katie tit. She only had hard balls but I squeezed them just like Billy. This made Katie whine a little. So I didn't squeeze so hard and Katie started sucking my penis again.
I felt I was going to have to pee soon. But I kept copying Billy.
Billy reached down and pulled Tina's legs apart and pulled her half on the couch and half on the floor he moved his fingers in her panties.
I moved my head so I could see his fingers better.
Billy saw what I was doing so he told Tina to take her panties off.
She looked shocked but Billy whispered in her ear and then Tina did get panties off.
I watched in pure amazement at how big and hairy Tina's pussy was.
I watched Billy move his fingers in Tina like he did with Katie. But his whole fingers went inside Tina.
Time began to moan and then wiggle like Katie does.
I moved my fingers in Katie's pussy like Billy did Tina's pussy.
I told Billy "I've got to pee Billy" Tina stopped sucking Billy's penis when he told me to go ahead. That he wanted to show Tina.
He landed over and pushed Katie's head further into my hard penis and I grimaced as I began shooting my pee in Katie's mouth.
Tina squealed and jumped on Billy's lap. He wrapped his arms around her. I told you, he said.
She started kissing Billy and her pussy was on his penis now. She was rocking back and forth with his penis in her pussy.
They kissed and I sat there with Katie still sucking my penis watching them.
I don't know how long they kept doing that. I fell asleep. I was awaken when Billy was putting my underwear back on.
He moved his hand to his lips. "Shhhhhhh it's our secret"