You wake up in the morning. After much hesitation you get out of bed, feeling a bit sleepy as usual. As you leave your room you hear some humming coming from the bathroom, but you ignore the noises and decide to go there anyway.

You slowly make your way to the bathroom, feeling extremely sleepy. You slowly open the bathroom door, you see your step-sister Lillie brushing her hair while looking at the mirror. She is wearing only a towel wrapped around her body.

Lillie: "Oh... good morning step-bro... You know you could have just gone downstairs because I'm almost done here..." She looks at you for a moment before brushing her hair again, not caring about the situation.

"Hmm... yeah, sorry. Didn't mean to bother you." She smiles sweetly at him before putting the brush down and turning around, presenting her naked back to him, hands on her hips. "So what do you want then? Can I help you with something?" Her voice is calm and soft as always.

"Hey!" Lillie exclaims as she realizes her towel is gone. She blushes and covers herself with her hands in an attempt to conceal herself. "You're such a jerk! Couldn't you have at least waited for me to finish or something?" she asks, annoyance creeping into her voice. Her face flushes even more as embarrassment washes over her.

With a huff, she turns back around and glares at you. "You're lucky I don't know how to defend myself," she mutters under her breath as you palm her bare bottom. She yelps slightly at the contact, blushing even more now. "Ohhh... stop it!" she whines, squirming in your grip despite herself.

Harder?" she asks breathily, her hips beginning to rock back and forth slightly against your hand. Her face is now flushed with a mixture of embarrassment and arousal as she feels herself growing wet between her legs. "Mmm... yeah..." she moans softly, arching her back ever so slightly.

With a soft moan, she gives in to the sensations, letting herself be carried away by your touch. She bites her lower lip and whispers, "Don't... stop..." Her body trembles as she feels increasingly vulnerable and aroused under your hand. With each slap, she squirms and moans, helpless against the sensations building inside her.

Hmm... (moaning) It feels so wrong... But it's just too good... Just do me like this, please. She arches her back, revealing the soft mounds of her breasts as they strain against the towel. Lillie lets out a series of needy moans, begging for more, eyes nearly shut in pleasure. Her fingers dig into the counter behind her, holding on for dear life as sensation after sensation washes over her body.

Gasping and moaning, Lillie arches her back even further as you slap her ass. Her eyes roll back in her head and she lets out a whimper that turns into a shaky breath. "Oh fuck... please..." She feels so exposed and vulnerable under your hand, but the sensation is driving her wild with desire. With each slap, she digs her nails deeper into the counter, willing herself not to come apart at the seams from this incredible pleasure. Her thighs tremble as she tries to steady herself against the onslaught of sensations coursing through her body.

Hmm... (moaning) Alright... if that's what you want. Just promise me you won't go too far... I don't want anyone else to hear us. She pants, her eyes still closed as she enjoys the sensation of your hand on her bottom. Her fingers curl into tight fists at her sides, nails digging into her skin in an effort to find some sort of purchase against the overwhelming pleasure building inside her.

The warmth spreading through her body grows more intense with each slap, sending waves of need crashing down on her like a tsunami. She arches her back again and gasps, "Ahh... ahh... yes..." Her hips begin to rock against your hand in time with her moans, seeking out the pleasure that seems so close yet just out of reach.

With each hard slap against her ass, Lillie's body quivers and moans, the sensations overwhelmingly pleasurable. She closes her eyes tighter, biting her lip to stifle her cries as she feels herself growing wetter between her legs. "Ah... oh... fuck..." Her words come out breathy and broken, punctuated by each impact of your hand on her bare skin.

Her fingers twist unconsciously in the towel, seeking purchase as her entire world narrows down to the sensation of being touched, owned by the forceful slap of his palm against her bottom. She squirms and moans, trying to find a way to arch further back into his touch, her breasts pushing out from the flimsy cover of the towel as she becomes lost in the mindless pleasure coursing through her veins.

Her whole body stiffens as your words sink in, and she realizes what you're suggesting. Her eyes fly open wide, shock and horror registering on her face as her movements abruptly stop. "N-no... please..." she whispers shakily, feeling a warmth spread between her legs as she becomes aroused by the thought of it.

Her breath comes out in ragged gasps, chest heaving as she tries to steady herself against the onslaught of emotions and desires coursing through her. With a quiet whimper, she closes her eyes tightly again, seeking escape from the reality of what you've just said...