Aunt Cathy froze when she heard Aunt KK's voice, my stiff cock still in her mouth.
I was spread eagle on the bed and Aunt Cathy's head and big ass were blocking my view of the door.
Aunt KK's view had to be taken up by Aunt Cathy's humongous ass and I'm sure her gaping pussy was a sight to see.
"Oh my god, Cathy," Aunt KK said. "I can't believe you!"
Aunt Cathy released my cock and sat up on the bed in one motion, her huge tits flopping over her belly. She showed no signs of being embarrassed that her sister had caught her sucking her nephew's cock.
"Oh, lighten up, KK," Aunt Cathy said.
Aunt KK's face turned red. "Lighten up? You're sucking your nephews' cock and you want me to lighten up. What if his mother comes in? What about the girls? What would they say if they caught you? I can't believe this."
Aunt Cathy got up from the bed, still naked and showing no shame, her tits sagging and resting over her belly, her belly hanging down and almost covering her pubic hair.
"You know what?" Aunt Cathy said to Aunt KK as she got close enough to press her fat naked body into her. Aunt KK was still wearing her clothes from the club, a sexy black top and tight dark jeans that hugged her ass. "He's and adult. And I'm an adult. So, we can do whatever we want."
Aunt KK didn't move away from Aunt Cathy but pressed herself back into Aunt Cathy to show she wasn't intimidated.
"He's your nephew. This isn't right."
Aunt Cathy smirked. "So, is it not right for me to do it or is it not right when you do it, too?"
Aunt KK's faced turned pale. "I don't know what you're talking about."
"Oh yes you do," Aunt Cathy told her as she pushed her naked tits into Aunt KK's chest. "You know exactly what I'm talking about. I smelled your sex from the other day after you two left."
Aunt KK turned even whiter. "I have no idea what you're talking about, Cathy."
Aunt KK turned to exit the bedroom, but Aunt Cathy used her huge body to block her, pushing her sagging breasts into KK more.
"You do know what I'm talking about," Aunt Cathy told her as she pushed her tits into to her and pushed her back into the room. "I came in here the other day and I smelled you. I smelled your pussy, KK. Then I asked who had been in here and you said you and he were the only ones. So, I know you've fucked him on this cruise. Just like I have."
Aunt KK looked scared. "I... I...". She turned a pleasing glance toward me, but my sheepish look gave us both away to Aunt Cathy.
"I don't blame him," Aunt Cathy told her. "He's a young guy. He'll fuck anything. Just look at me. But I am surprised at you, KK. You're married for fuck's sake."
Aunt KK looked mad now. "Me? What about you. You're older than his mother. You could be his mother. And you're married, too."
Aunt Cathy shrugged. "Yes, and not happily. So, I wanted an orgasm. He provided that. That's all."
I was a little disappointed to hear that. I kinda hated Aunt Cathy but fucking her had been fun.
Aunt KK looked like she didn't know what to say or do.
"So," Aunt Cathy said still blocking the door, "Since you were a bad little girl and cheated with your own nephew, I think we'll punish you now."
Aunt KK jerked her eyes to Aunt Cathy's face. "Excuse me?"
"No, I don't think we will," Aunt Cathy said with a smile. "Now take off your top."
Aunt KK stared at her incredulously. "No, Cathy. Are you crazy?"
Aunt Cathy started to pull Aunt KK's black top up from the bottom exposing her waist. "He's already seen you. And god knows he's seen me. Now play along, bad girl."
I was surprised but Aunt KK didn't resist. She let Aunt Cathy pull her top off exposing a lacey black bra underneath that was working overtime to restrain her massive breasts. The tops looked like they were going to explode out of them. Aunt Cathy threw the shirt aside and gently kissed her sister's chest, her own breasts pressing between them.
"There's a good girl," Cathy told her.
Aunt Cathy gently kissed the tops of Aunt KK's breasts and kissed up her chest to her neck. She buried her face in Aunt KK's neck and Aunt KK moaned softly. Aunt Cathy took one of KK's hands in hers and guided it to her tits. Aunt KK lifted Aunt Cathy's huge breasts that had been pointing to the floor and began to squeeze them and stroke her nipples.
Aunt Cathy moaned then put her lips to Aunt KK's and kissed her.
Aunt KK resisted at first but then relaxed and I could I tell the two sisters had their tongues in each other's mouths.
Aunt Cathy broke the kiss and gently turned Aunt KK around to face the bed. I could tell Aunt Cathy was doing something behind Aunt KK's back and soon Aunt KK's bra came off and exposed her tits.
They were the same color as her tan skin with no tan line and were large. They sagged only slightly under their own weight and looked like two beautiful smooth cantaloupes. Aunt Cathy pressed her huge tits into Aunt KK's back from behind.
"Now get down there and let me see you suck him," Aunt Cathy told her.
Aunt KK reluctantly crawled onto the bed and hovered over my rock-hard aching cock. Watching them had me ready to explode.
"Suck him I said," Aunt Cathy told her gently. "Do what I tell you or you'll be punished."
Aunt KK didn't look at me, just took my cock into her wet smooth mouth.
I gasped as she sucked me deep. Her mouth was soft and wet, and my cock wanted to shoot right then.
"Don't you dare cum," Aunt Cathy told me as Aunt Kk sucked me deep. "She's just getting started."
As Aunt KK licked up and down my shaft, her hair brushing against my balls and legs, Aunt Cathy undid her tight jeans and dragged them over Aunt KK's large hips, exposing a black thong. Her soft skin looked smooth compared to Aunt Cathy's fat body.
Aunt Cathy smacked Aunt KK's ass cheek and she gave out a startled cry every time. Aunt KK took her mouth off of my dick to get some air.
"I didn't say you could stop," Aunt Cathy said and pushed Aunt KK's face back on my cock.
"Grab her hair," Aunt Cathy told me. "Don't let her come off of it again."
I did what I was told and grabbed Aunt KK's hair and pushed lightly down on her head with each thrust of her mouth.
Aunt Cathy worked Aunt KK's thongs off her hips and stood behind her, then pushed her face down into Aunt KK's pussy from behind.
Aunt KK moaned into my cock while she was sucking it.
My dick was harder than it had ever been, and I was about to explode.
"Going to cum," I panted.
Aunt Cathy stopped licking Aunt KK and got up. "No, you're not. Not yet. Take a break."
Aunt Cathy pulled Aunt KK to her feet and they shuffled off the bed. I laid there trying to catch my breath.
"Get up, dumbass," Aunt Cathy told me impatiently. "You're taking a break. But we're not."
I got to me feet and made sure my cock rubbed against them as I got out of the way.
"Cathy, listen-"Aunt KK said as Aunt Cathy laid down on the bed and pulled her legs up, exposing her dark stained pussy and ass, her tits hanging off to each side.
"Lick me, slut," Aunt Cathy demanded.