All characters in this story are over 18.
*****
After 9 o'clock, Louise woke and shook her son. He stretched, kissed her, stretched again. She urged him up.
"C'mon, sleepy-head. Let's go get some breakfast."
"Can't we just stay here, send out for pizza or something?"
"Hmmm, nice idea. But no. Here's another idea. What if we behave like those two women thought? Y'know, cougar and her cub."
"Yeah. Nobody knows us here, let's be..."
"What?"
"Feels weird, saying this to my mum! Let's be lovers!"
Louise laughed. "After what we've been doing, it's not so weird."
He became serious for a moment. "Mum, I love this, being intimate with you. And you said you like it too. But, well, it's..."
"Incest. Wrong. Taboo. I know. Can you say it, admit it too?"
"I can. I'm committing incest with my mother. And it's very, very right. Hah! Maybe being so wrong is what makes it right, you know?"
"Yes, honey, I think I do know. And I'm glad we aren't pretending about what we're doing. Now go take a shower."
"Come with me."
"Oh, I'd like that. Yes."
They soaped each other, giggling like teenagers exploring each other's bodies. Louise sprang the surprise she'd planned as soon as they'd finished washing. She dropped to her knees and before Joey knew what was happening she already had her mouth around his cock.
Oh jesus. She's... I can't believe it. Mum's sucking my cock.
He was hard almost instantly, despite this being the approach to his third ejaculation in so few hours. But the wetness of her mouth, and the knowledge that it was his own mother sucking his cock, made sure he rose quickly to heights of pleasure that could have only one result.
Louise's mouth bobbed up and down on his knob and one hand stroked his shaft rhythmically while the other gently cupped his balls. Joey watched, overjoyed at the feeling and urged on by the sight. His cock, in and out of her mouth.
Oh my! His cock is so lovely! Will I let him...in my mouth? I never have before, but...it's Joey. My son.
She kept it up for three or four minutes. Try as he might to prolong this new peak of sensations, Joey couldn't stop the surge as he came, in short sharp spurts.
In mum's mouth! I'm cumming in mum's mouth!
His knees weakened as his bolts shot from him. Louise sucked gently, feeling the pulses, tasting the salt cream as her son's cock gave up its charge. He came quickly, she sucked it in and swallowed it before slurping the last of it off the end of his cock.
Oh my! I just sucked my son off. I like his jizz taste, though.
She laughed. Joey looked at her with a question in his eyes.
"Oh honey. It tastes like last night's champagne!"
He laughed too. Joey rinsed off while Louise dried herself. He hugged her from behind, kissed her neck, and whispered in her ear:
"I told you, you are the sexiest woman on this ship. Maybe in the whole world. To me."
During the day they played bingo, table-tennis, ate a light lunch, joined the gymnasium. Part-way through the workout, both sweating freely, Joey sidled up beside his mother on the treadmill. As she jogged in warmdown mode, he said to her:
"That bloke in the black shorts and blue t-shirt has been ogling you for ages."
"So?"
"I'm jealous!"
She laughed, blushed proudly, then decided to make him proud too. She switched off the machine, stood beside him and planted a big, wet, tongue-kiss on him. At first Joey tensed:
What the fuck? I can't kiss my mum like this in public! Oh, yeah. She's not my mum to them...
"I better start calling you 'Louise', hadn't I?"
"If you want. Or 'baby', or 'honey'. But not 'cupcake' OK?"
He laughed: "I like 'honey'."
"OK, 'honey' it is. Now, I'm all sweaty, you are too. We both need a shower. Wanna get nasty first?"
Joey looked around him, afraid somebody had heard. He looked at his mother, grinning at him as she towelled off, and said: "OK honey."
That evening, after a seafood dinner and white wine, they held hands while walking around the promenade deck. It was cold - they hadn't sailed far enough north yet to enjoy the tropics - so almost nobody braved the cold southerly wind. But Louise had an idea.
She led him to that secluded, sheltered spot they'd shared last night. Joey smiled, remembering how his heart had hammered in his chest as he'd lifted his mother's dress, put his hands on her bare bum, and then the first touch of her wet, spongy pussy...
Louise snuggled in close, patted his chest, and whispered in his ear: "I'm not wearing any panties."
"What?"
"I took them off when I went to the loo. Y'know, in case you wanted to feel me up, here, where it started last night."
His hand had already begun its journey before she'd finished her invitation. She parted her feet, opening herself for him. Joey was surprised to find she was already wet, and slid two fingers inside her straight away.
"Ooh, yes baby. Keep an eye out in case somebody comes. Keep doing that."
He teased her. While gently finger-fucking, he only allowed occasional, fleeting contact with her clit even when she pressed against him.
"Oh you little bastard. Teasing your mother like that!"
But her gasps and panting told him she was loving it. Some minutes after he'd first put his fingers into her, he cupped her mound firmly, the two middle fingers bent in her quim, while he rubbed his palm against her. She rocked her hips back, grinding her clit along his hand, and began to moan softly.