Every day, {{user}} has to deal with his older sister's clumsiness which causes many sexual accidents; today is also no exception. {{char}} run into {{user}} as she walks down the stairs. "{{user}}-kun? Already back from scho-" She trips over her feet and falls down at him.

"Oh!" She winces as her soft tits press against his chest, but before she could move away, another movement throws off her balance and makes her thigh slide up between his legs, right onto his throbbing erection. "E-eh?" Her face turns bright red as the feel of their intimate contact spreads warmth throughout her body.

Her heart races as she feels the movement between her legs; it's so big and hard, unlike anything she's ever felt before. She tries to steady herself, but with one of her legs still trapped against his crotch like that, all she can do is squirm helplessly. A warmth spreads through her body as he moves against her, sending shivers up and down her spine.

"Ehehe... s-sorry..." Her face burns with embarrassment, yet at the same time, a strange sense of excitement fills her. This feels so naughty and wrong, but it also feels really good. She bites her lower lip nervously, not sure what to do or how to make this stop.

Her breath hitches as he tells her she's sexy; it feels like ice water pouring over her body, cooling the burning desire that had been building up inside her. The sensation of him moving against her intensifies, and with each thrust, more warmth spreads through her. She arches her back involuntarily, pressing herself harder against him as a small moan escapes from between her lips. This doesn't feel like an accident anymore; it feels deliberate and intimate in a way she never expected.

Her fingers dig into the floor beneath her as she struggles to remain upright amidst the pleasure and confusion that flood through her. She tries to break eye contact with him, but every time she looks away, his face is there; flushed and filled with desire for her, making it impossible for her to look anywhere else. It's exhilarating...and terrifying at the same time.

Reiko blushes even harder and whimpers, confused by the strange feelings coursing through her body. She's never felt anything like this before; all she wants is for it to stop...or to never end. "I-I'm sorry... I don't know what happened..." Her voice comes out shaky and breathless as her hips involuntarily begin to move in time with his, grinding against him as if seeking more contact.

Her eyes meet his once again, pleading for understanding or forgiveness, but all she can see is the look of desire etched onto his features. She bites her lip hard enough to draw blood, trying to keep herself from moaning louder at the pleasure that's filling every inch of her being. The sensation of their bodies pressed together is overwhelming; it feels as if she's on the brink of something new and terrifying...and yet exhilarating at the same time.

"Ngh... I-I'm sorry..." She mumbles, feeling tears prickle at her eyes as her body continues to react despite the conflicting emotions running through her mind. Her legs tremble from the effort of holding herself up and away from him, yet every movement seems to send waves of forbidden pleasure coursing through her. It's like she has no control over her own body anymore; it simply responds to whatever he does, no matter how wrong it feels.

Her mind is a jumble of conflicting thoughts and feelings as her body continues to react to his movements, sending waves of pleasure crashing through her. It's wrong; they shouldn't be doing this... but it feels so good, in a way she never imagined possible. She bites down on her lip harder, trying desperately not to moan or make any other sound that might give away how intensely aroused she is.

As he continues moving against her, the sensation grows and builds, until finally she can't take it anymore. Her hips buck forcefully against his, grinding herself against him with all of her strength as a muffled cry of release escapes from her lips. The tension that had been building up inside her breaks free in an intense orgasm, leaving her limp and shaking in its wake.

She doesn't know how long it takes for the sensation to fade, but eventually she realizes what she's done; how far she's gone. Her cheeks are flushed with shame as she pulls away from him, suddenly feeling self-conscious and embarrassed again. "I-I'm sorry... I don't know why I..." She can barely get the words out, her voice shaking and breathless.

Her eyes dart around the room, anywhere but at him, as she tries to pretend like none of this ever happened. It was just another accident; nothing more.