Option 1: Rose Potter and her Cheating Nympho MILF

Rose Potter stirred and groaned weakly as the first rays of morning light filtered through her curtains and fell onto her face. Lying sprawled out on her bed, covers thrown to the floor, she was the very picture of a debauched whore. Gooey, pearlescent ropes of thick cum criss-crossed her body, from the soles of her feet to the tips of her hair, and further stained the sheets she lay upon with every twitch as she awoke. Her delicate hands roamed over her body in a post-slumberous delirium, gathering handfuls of the gelatinous slime and smearing it over her body like she was lathering herself in soap. Pale skin, already seeming to glow in the half-light of the room, now glistened with the evidence of her depravity as she rose from her bed and retrieved her wand from the bedside table.

"Pruriessence Evansco."

A quick flick of the stick erased any evidence that the bed and its surroundings had ever been soiled, and another levitated the tangled covers and laid them out neatly upon it. Slipping her cum-slick feet into the strappy, high-heeled sandals she'd been wearing when she'd dragged... How many men did I bring home, again? Ah, well, Rose shrugged and turned to leave, it's not that important. Her hips rolled as she sashayed out of the room, her bubble butt and bountiful bust bouncing a little with every step - a legacy of raiding her mother's office for beautifying potions and notes on experimental cosmetic charms since she was old enough to care about her looks. Definitely worth all the times I accidentally turned myself orange.

Thick globs of cum oozed out of her pussy and ran down her thighs as she entered the kitchen and her core throbbed at the sight of her mother leaning against the counter. Lily Potter was one of the finest charms mistresses that Hogwarts had ever produced, with a mind like a razor and a creative flair that had made her the biggest innovator in the field of her generation. It had been her defences that had stalled Lord Voldemort long enough for Albus Dumbledore to arrive on the night he came to kill her children, and then prevented him from escaping as his long-time foe had dueled him to the ****. She'd even managed to keep the old man alive in the aftermath, at least for long enough to give his statement of what had occurred and confirm that the dark lord was indeed dead.

She was also, thanks to her focus on cosmetic and medical charms and her rather liberal attitude to self-experimentation, the single sexiest woman the Rose had ever seen. Where the younger Potter woman had inherited her father's lean, athletic build, making it clear to anyone who saw her that her large breasts and butt were deliberate cultivations, the elder had essentially rebuilt herself over the years into the ultimate expression of MILF-hood. Long, thick-thighed legs blossomed upwards into broad hips and a large apple ass, then slimmed down into a tight waist with just a hint of abs before flaring out again into a pair of heavy, milky teardrop-shaped breasts. Her green eyes sparkled with intelligence and mischief and her plush, ever-glossy lips quirked into a smile at the sight of her daughter.

"Morning, Mum," Rose chirped, eyes roaming over her mother's equally-nude form, "I take it Dad and Harry aren't back yet."

"Not yet," Lily sighed theatrically, "they sent an owl saying the game overran and they had to stay with the Weasleys overnight."

"You mean, Harry made up some excuse to stick around and try to get Ginny to notice him again," Rose shot back. "It's a shame, I was looking forward to seeing their reaction to this." She gestured to her body, glistening with cum. Lily frowned and approached her daughter, eyes flicking this way and that as she inspected her. "Prior Incantato Maxima," she pronounced, watching threads of light unspool from the tip of Rose's wand. "Not a single contraception charm," she gasped, "what were you thinking?" Rose just stood there, unashamed, and met her mother's appalled gaze with a steady stare. "I was thinking," she smirked, "of how fucking hot it would make me to tell Dad that his precious, innocent daughter was going to be a teen mother, and that she didn't even know who the father was because she'd been getting gangbanged raw every couple of nights since she turned eighteen."

"Oh, fuck," Lily gasped, expression morphing first into shock and then into pride, "that's brilliant." She licked her lips and closed her eyes as her daughter preened, imagining not only James' reaction to the news, but his reaction to his darling wife congratulating Rose and offering tips on anal so she could keep up her slutty lifestyle right up until the birth. Even if it would reveal her own cheating nature - the redhead having never allowed her husband access to her backdoor - the high she'd get from that final, ultimate betrayal would be worth it. "You really are amazing, Rose."

"I learned from the best," the younger woman replied, leaning in and planting a quick kiss on her mother's cheek with sticky, jizz-glossed lips.

"That reminds me," Lily smiled, "I've got some news for you..."

OPTION 1: Lily's new invention, the Infidelius charm, is ready to cast. With it, James and Harry will be unable to process the pair's nature as wanton sluts, letting them get up to all sorts of sexual antics in full view of them while the two men perceive only innocent activities.

OPTION 2: Molly and Ginny Weasley [Ginny and Luna Lovegood having been aged up further to the same age as the Potter twins] are going to be meeting them later in a little-known shopping district known as Carn Alley, to buy some 'specialist' Hogwarts supplies to make their first year experience as fulfilling as possible.

OPTION 3: As a staff member at Hogwarts (specifically, the Charms professor), Lily has been asked to lead a muggleborn named Hermione Granger through her first visit to Diagon Alley and managed to get Rose allowed along for the trip, giving them an opportunity to show the girl how the Wizarding World really works.

OPTION 4: Something else! Feel free to write suggestions in the chapter comments, if you have an idea but don't feel confident that you can write it.