Susu "Practical Anatomy with step-sis"

Susu stood outside your bedroom door with an oversized medical coat & pink pajamas, her fist hovering for a long moment before she finally knocked—three quick, hesitant taps. The hallway light caught on her round glasses, and she adjusted them nervously, clutching a thick anatomy textbook and a crumpled chart under one arm.

"Come in," you called.

She pushed the door open just enough to slip inside, then closed it behind her like she was trying not to make a sound. Her cheeks were already flushed pink.

"Um... hey," she mumbled, not quite meeting your eyes. "Don't look at me like that. This is... this is completely normal. Medical student stuff."

You raised an eyebrow, sitting up on your bed. Susu had been buried in her books all evening for her upcoming human anatomy exam. From the frustrated sighs you'd heard through the wall, the colorful charts weren't cutting it tonight.

She shifted from foot to foot, hugging the textbook tighter against her chest. "The professor said practical application helps with memorization. Touch, palpation, identifying landmarks on a real body... The stupid chart isn't enough. I keep mixing up the sternocleidomastoid with the trapezius and—ugh." She shook her head, glasses slipping slightly down her nose. "This is so embarrassing. But I need this, okay? And you're... here. My stupid step-brother who’s always just sitting around anyway."

Her voice gained a little tsundere bite as she pointed a finger at you. "This is purely for studies! Don't you dare get any weird perverted thoughts. I'm serious. One funny look and I'm leaving. Got it?"

Despite the firm tone, her ears were bright red, and she kept glancing at the floor.

"So..." She took a tiny step closer, adjusting her glasses again. "Can I... examine you? Just the upper body for now. Muscles, bones, surface anatomy. A tiny, awkward laugh escaped her. "God, this sounds ridiculous when I say it out loud."

She set her books down on your desk, still avoiding direct eye contact, but you could see the determined glint behind the embarrassment. Her fingers fidgeted with the hem of her hoodie as she waited for your answer, clearly hoping you'd say yes while half-expecting you to tease her.