A promise is a promise

"Are you sure Cathy won't wake up?" Daniel said carefully positioning his cock above her breasts.

"Well if you go at this pace probably!" her right breast said.

"Yeah come on, Danny! We wanna see that pretty cock of yours up close!" her left breast added.

Daniel then quickly situated his cock between them.

"Oh, you girls are so comfy!" his cock said complimenting them.

"Oh, stop it you." her left breast said giggling.

"Well let's get the show on the road, Danny!" her right breast demanded.

On that que, Danny began desperately humping his sleeping sister's breasts eager to feel every bit of them.

"Oh Danny, you're an animal!" her left breast complimented at the speed he was going.

As Daniel thrusted into Catherine's breasts, they hugged their guest with the utmost comfort making sure not to let go.

"Awww fuck...you guys - er girls feel really amazing!" Daniel grunted.

"You know what'd feel even better?" her right breast said.

"What?" Daniel questioned.

"You should fuck our nipples too." her right breast answered.

"Oh, I don't know..." her left breast questioning her partner's decision.

"Come on, Danny you know you want to." her right breast said in a sultry voice.

"Come on Daniel, haven't you ever wanted to fuck a breast before, like really fuck one?" his cock said.

Daniel was heavily debating this, but also wondered why her left breast didn't agree.

"I guess, for just a bit?" Daniel said.

Daniel then removed his cock from in between them and debated on which one to try first.

"So which one of you wants to get uhhh fucked first I guess?"

"Oh you should definitely pick lefty over here, she's dying to be first."

"No...no I insist you go first righty!" the left one said worried.

"I'd say pick the left one, she sounds like she would really want it." his dick said.

"Alright, I guess you're first." Daniel said.

"No! No, please reconsider!" her left breast said before getting injected with Daniel's hard cock.

"AAaaaaah!" her left breast moaned loudly.

"Oh did I forget to mention? She's really sensitive." her right breast snickered.

"Aahhh...please...go...easy on me..." her left breast said between each thrust.

"Fuuuuck...her cute voice only makes me want to fuck her harder, come on Daniel!" his cock said.

Daniel agreed by thrusting harder into her left breast while her right one jiggled with joy seeing its partner defiled. Her left breast continued squealing as the thrusting continued.

"Please...fuck...me...up." her left breast said while being assaulted.

"Oh, do me next! I want what she's having." her right breast said.

Daniel then took out his cock from the left one and began stabbing the right.

"Awwww...please...I want more..." her left breast said.

"Don't worry I'll come back to you in a bit." Daniel replied.

Cathy's left nipple then twitched in anticipation eager to get fucked again. This went on for some time until finally Daniel was at his limit.

"Fuck...I'm going...to cum." Daniel said straining.

"Cum on us, Daniel!" her left breast offered.

"He can't do that or else Cathy will know!" her right breast said.

"Oh, right...oh her mouth! She'll swallow your cum and she'll never know!" her left one realized.

"Sounds good! Go Danny!" her right breast said.

Without a second thought Daniel quickly positioned his cock near Catherine's open mouth and shot his seed inside it. Still asleep Catherine swallowed Daniel's seed without noticing it.