Yes

“DAVE”, Brenda said loudly.
My hands stopped and I looked at her. Joy also stopped.
“You may have noticed that when it comes to sexual matters Joy does exactly what I say. If you want to touch her titties you will have to ask me.”
I felt myself swallow. I had never been in a situation like this. I decided to ask.
“May I touch Joy’s breasts?”
“After you have sucked mine”
“But I thought you were a lesbian”.
“Well.. mainly. But once in a while a change can be quite pleasant, and it has been a while. But don’t forget, I am in charge”.
I stepped out of my shorts and knelt in front of Brenda, who was sat in her deckchair.
She leaned forward, and they swung and quivered.
“Lick my nipples as if they were an ice cream”, said Brenda quietly.
They were heavy, sagging and a little wrinkled and they excited the hell out of me.
I leaned forwarded and extended my tongue. I felt the rubbery teat on my tongue end. I slowly leaned further forward and down onto her tit, taking more of it into my mouth. I felt her shudder.
“Joy come here and kneel besides Dave”, ordered Brenda.
Joy did as ordered and sneaked a sideways glance. Her small rosebuds were hard.
“Suck my other tit”.
Joy complied. We were like twins. Brenda put both her hands behind our heads and firmly held them on her nipples. I became lost in the pleasure of sucking on her nipple.
Brenda started to breathe deeply. I felt her hand tug on my cock for a few seconds and then stop. That was probably a wise decision. I would not have lasted very long and I was not ready to cum yet. Suddenly Brenda stiffened and gave a little whimper and then she relaxed. It wasn’t a big cum but a cum it was. I stopped and glanced at Joy who had also stopped. I could not help it. Without Brenda’s permission I reached out and gently touched Joy’s left titty.
“DAVE”, said Brenda, “You did not ask permission”.
“Sorry”, I replied.
“You will have to pay a penalty for that. Now let me think. Yes, that would all fit together nicely”.
“There is something I have to tell you Dave”, said Brenda.
“Joy and I recently had a bet with each other. Joy lost and has to pay up. Now would be a good time. The penalty for loosing was that the loser had to suck a man’s cock and swallow his cum. Your penalty, Dave, is that you have to suck Joy’s pussy until she cum’s”.
“Oh, please”, said Joy, “ We were drunk when we had the bet. Please don’t hold me to it”.