You look at Beth's new huge ass and can't help but begin changing her further. You concentrate on her, imagining her as a loving mom. Her dark brown hair seems to thin out ever so slightly, even growing a few stray grays. She pulls out her hair bobble, allowing her hair to flow over her back, you notice her arms grow and chub up slightly with mommy muscle and fat, as well as developing some freckles. Her back and legs also grows slightly, stretching her figure and increasing her height from 5'7 to 5'11, just taller than yourself. her stretched out frame quickly comes back into proportion as her thighs thicken and firm up, leaving her with a set of juicy thunder thighs. She tugs at her bikini bottom, pulling it out from her deep buttcrack as her ass and hips grow further. She is left with a fatter but still firm and bountiful backside with a set of wide, child-bearing hips.
Beth turns around and sits up to face you as you continue speaking, you can't help but smirk at her obliviousness to what is happening. Her belly inflates with excess fat, making her look almost obese before distributing around her torso, her waist blessed with a sexy set of love handles and her boobs growing from firm E-cups to hefty F-cups, her nipples grow and harden, clearly poking through her already large bikini top and giving her a rich cleavage as her new tits struggle to stay in place.
"She makes a very hot mom" you think to yourself, not realising the changes arent finished yet. Her face develops early signs of wrinkles and she loses her youthful glow, giving her a worn in but still gorgeous face as her lips thin out slightly. Finally Beth completes her transformation into an older version of herself, to boot she now starts referring to you as 'sweetie', confirming to you that her mind has also been altered, you look at her up and down and grow increasingly erect at her thicc MILF figure and sweet, motherly mannerisms as you continue talking.
Suddenly Beth raises her eyebrow and crosses her arms "hold on, did you put on any sunscreen Jack sweetie?" she asks in an almost stern tone, like your own mother would. "Err-" you muster out before she cuts you off.
"Err, no you didn't did you? You're lucky i brought some mister, wouldn't want my sweetie to burn now would we? sit on my lap and i'll put it on." she pats her thighs playfully, causing them to ripple and shake, while maybe this might seem a tad inappropriate you're too horny to care, you go red in the face as you shift over to her and sit on her luscious thighs, she grabs your ankle and waist to hold you in place, you are surprised at her strength but it also turns you on further, there's no way she doesn't notice your boner.
"Arms up sweetie" she says cheerfully, you raise your arms up and she lifts your t-shirt over your head. "My oh my, you've gotten big honey" she says as she looks at your well-worked chest, you swear you saw her bite her lip in your peripheral, she takes out a bottle of sunscreen from her bag and puts some on her hands and rubs them together. "I can put some on myself, Beth" you say to her, "Go ahead sweetie, but remember, just because we're in public doesn't mean you have to call me Beth, you can call me mommy if you like, I won't tell your actual mom." she says as she wrapped her arm around you, holding you in close and giving you a peck on the cheek, "Sure." you reply as you share a smile.
Beth begins rubbing lotion over your upper body while you cover your legs, as she goes over your pecs you catch her biting her lip again, eventually you lay down sprawled over her knee like a child as she rubs down your belly. "Oh?! what's this sweetie?" she says teasingly, you sit up to find her oogling at your erection, you go red faced as she grins at your embarrassment. "Sorry Beth, it's just all the touching and well.." You gesture to her huge tits, causing her to blush, "It's okay sweetie, let me help you with that." she replies seductively. She gently pushes you off her legs and onto the sand and she stands up, scanning the beach as you stare at her huge butt. she kneels down and pulls out the umbrella, moving it to face the few remaining beach-goers and sticks it forcefully into the sand at an angle, obscuring the two of you from the rest of the beach. she returns to face you, forcefully lifting you to your feet and pulling down your shorts, exposing yourself to her, she pushes you over onto your back and she tugs your fallen shorts from your feet and tosses them to the side. She grabs your legs and pulls you closer to her, you lay there feeling helpless, yet you like it.
Beth grabs the bottle of sunscreen and applies more to her hands, rubbing them together to lubricate herself. She grips your hard erection and begins slowly jerking you off with expert technique, you throw your head back and moan in pleasure as she goes to town on your engorged member. Before reaching climax she stops, climbing on top of you and pulls you in for a deep kiss, forcing her tongue down your throat as you grab hold of her meaty thighs. "I love you Jack honey" she exclaims as she grinds her moist crotch against your cock, "i love you too mommy." you reply, squeezing her hefty tits through her bikini. She pulls off her bikini top and unties her bottom, dropping them to the floor, displaying her huge mommy tits and moist cunt to you. She sits up and grabs you, pulling you into her and laying onto her back, "Jack, I want you to fuck me." she says as she pinches her nipples, you guide your cock towards her and slide deep inside with no resistance, the two of you press up against each other as you kiss passionately. After a few minutes of pumping her vagina and playing with her tits and ass she reaches a finger round your back and sinks it deep into your ass, you almost immediately feel your balls swell and brace yourself before unloading deep inside Beth. The two of you lie exhausted on the sand, cuddling sweetly without a care in the world.