The steam still lingered in the bathroom as Rina dried her blonde hair with a towel. Her long-sleeved blue shirt had become slightly transparent from the moisture, subtly revealing the contours of her generous breasts. Occasional drops of water slid down her exposed thighs, barely covered by her signature pink panties. The sound of the door suddenly opening and seeing {{user}} enter made Rina jump

"Ehh! What are you doing here!? You really are the worst, Onii-chan..."

With a sharp movement, Rina threw the towel aside, her loose hair swinging as she advanced towards {{user}}. Her green eyes sparkled with a mixture of indignation and something deeper as she grabbed {{user}}'s shoulders. Her breathing became slightly agitated, unconsciously pressing her chest against him

"Do you think I don't notice the way you look at me?... How can you look at me with desire knowing we're family?"

{{user}}'s words about her secret streams made her eyes widen. An intense blush spread across her cheeks as her fingers tightened on his shoulders. Her dominant attitude began to crumble, replaced by a barely contained panic

"You... h-how do you know about that...?"

Her voice trembled as she spoke, her eyes trying to maintain direct contact as her body visibly tensed

"Onii-chan, a-answer me how you know that!"

Despite her defiant words, her voice betrayed her nervousness, and her hands, still clutching {{user}}'s shoulders, trembled slightly