Supervillain Idol System: My Sidekick Is A Yandere

Don's room was dimly lit, shadows stretching across the walls.

He stood by the closet, taking off his shirt and tossing it onto a nearby chair. His pants followed, leaving him in just his briefs.

The cool air brushed against his skin as he made his way to the bed, the mattress creaking softly under his weight.

He lay there, staring at the ceiling, thoughts swirling.

'Maybe I can catch a few hours of sleep…'

A faint sound interrupted his thoughts—a subtle shuffle outside his door.

His eyes narrowed. He reached over to the dresser, picking up a small remote. With a press, the door clicked open slightly.

**Click**

Summer stood in the hallway, caught mid-step. She stumbled back, eyes wide.

Don raised an eyebrow. "Can I help you, or do you just enjoy stalking me?"

She rolled her eyes, stepping into the room with exaggerated confidence. "Get over yourself. I heard you come in and wanted to see if you're still in one piece."

Her attire was minimal—booty shorts with visible panty straps rising above the waistband, a loose vest barely covering her chest, and white knee-high socks.

She struck a pose, hand on her hip, head tilted away with a mock frown.

Don smirked. "Aww, such a sweet little sister. Or should I say big? Because is it just me, or are you getting rounder?"

Her ponytail whipped as she turned to glare at him. "The fuck do you mean by 'rounder,' you jerk?"

He sat up, swinging his legs over the edge of the bed. "I mean, if I hadn't sensed your bad attitude behind the door, I would've thought you were Mom."

Her expression twisted into a deeper scowl. "Take that back!"

She lunged at him, hands reaching for his head. Don anticipated the move, grabbing her waist and lifting her off the ground.

"Hey!" she yelped as he pulled her onto the bed, rolling back with her in his grasp.

They landed with a soft thump, the bed protesting under their combined weight. Summer squirmed, trying to free herself, but Don held firm, a grin appearing on his lips.

"Let go of me, you asshole!"

He chuckled, not loosening his grip. "Make me."

She huffed, finally going limp in his arms. "You're such a pain."

"And yet, you came to check up on me."

Summer's struggles soon became more frantic, her hands flailing as she tried to reach Don's head, but he held her firmly in place. "Just what are you doing?" Don asked, his voice filled with amusement.

"Shut up, I'm—" she started, but her words cut off abruptly. Her vest had ridden up, exposing the lower half of her breasts, and the warmth of her pressed against Don's chest.

He could feel the fullness of her against him, and for a moment, the teasing stopped. The air carried anticipation as they both froze, the only sound the soft ~ rustle ~ of fabric against skin

Her face flushed a deep crimson as the warmth of her skin against his sent a shiver through her. "Alright, fine, you win," she muttered, her voice trembling slightly. "Now let me go." Don's grip loosened, but he didn't release her entirely, his fingers brushing against her waist.

Don smiled at her, his voice low and teasing. "I don't think I will. I like seeing you all flustered. It's so cute."

Summer's cheeks burned even brighter, her face a deep shade of red as she squirmed under his grasp. "Shut up and let me go, you jerk!" she demanded, her voice now hinted with frustration, though her struggles were losing some of their intensity.

Don's fingers tightened slightly around her waist, his thumbs brushing against her skin in a way that sent a shiver through her. She hated how her body reacted to his touch, but she couldn't deny the warmth spreading through her chest.

Summer only worsened things when her vest rose higher, her nipples now pressing firmly against Don's chest, the warmth of their skin mingling as they both froze once again. But Don kept his fingers tightened slightly around her waist, his thumbs brushing against her skin, sending another shiver through her.

He did this for a moment before his grip loosened, and he muttered a sheepish "oops" as Summer instantly pulled away, her face still a deep crimson. She sat up straight, yanking her vest back down with one hand, her eyes darting anywhere but at him.

Don just laid there, a mixture of amusement and awkwardness on his face, but he didn't push the issue. Summer, still straddling him, shifted uncomfortably, her hands now clenched into fists at her sides.

She muttered under her breath, her voice barely audible but irritated, "Jerk, you wouldn't be so stuff without your powers."

Don raised an eyebrow at her comment, but before he could respond, he decided to push his luck. He let out a dramatic sigh, shaking his head in mock disappointment. "How am I the jerk when you're the one who took away my wonderful view?" he teased, his tone light but playful. Summer's cheeks flushed deeper, but she didn't pull away, her hands still clenched at her sides.

She huffed in irritation, her shoulders squaring as she kept her gaze stubbornly fixed on the wall. "Go find another view then," she muttered, her voice carrying a defiance that didn't quite hide the underlying vulnerability.

Don's smile widened, his eyes gleaming with amusement as he leaned back slightly, his hands still resting casually on her waist. "Why do that when I have a great one right here?" he replied, his tone light but with a confidence that bordered on arrogance. "Grumpy but meh, it'll do," he added, his voice dropping to a playful whisper that sent a shiver down her spine despite her best efforts to remain unaffected.

Summer's frown softened, her cheeks still flushed but her posture relaxing as Don's teasing became a steady, comforting sound in the background.

She shifted slightly, her confidence growing as she realized that despite the earlier awkwardness, Don's playful jabs didn't make her feel vulnerable. In fact, they had the opposite effect—each teasing remark chipped away at her hesitation, replacing it with a daring sense of boldness.

Summer's fingers toyed with the hem of her vest, her eyes locked on Don's as a mix of defiance and hesitation lingered in her gaze.

The room seemed to hold its breath as she slowly began to tug the edge of her vest upward, the movement almost imperceptible at first. Don's smirk faltered, his eyes widening as realization dawned.

With a swift, bold motion, she pulled the vest over her breasts, exposing the full, soft curves of her tits. The air seemed to thicken, heavy with unspoken desire, as Don's hands instinctively tightened around her waist. Her heart pounded, but there was no turning back now.

Summer's face burned as she felt Don's grip tense up, her boldness crumbling into regret the moment the fabric left her fingers. "Here!" she muttered, her voice trembling as she glared at Don, trying to hide her vulnerability with defiance. "Stare or whatever, I don't care!"

The words hung in the air, full of a bravado she didn't fully feel. Don's eyes widened, his smirk fading as he stared at her, the teasing glint in his eyes replaced by something heavier, more serious. He hadn't expected this, hadn't pushed for it, but now that it was here, he didn't hesitate.

His hands tightened around her waist even more as he shifted slightly, his fingers pressing gently into her skin. Summer let out a flustered "H-hey!" as he pulled her down more firmly onto his lap, her cheeks burning even brighter.

She tried to push back, but her resistance was half-hearted, her body betraying her as she leaned into his touch. Don's face was inches from hers, his warm breath brushing against her skin, sending shivers down her spine. She avoided his eyes, her gaze falling on the curve of his neck instead, but she could feel his intense stare on her.

Don's hands rested traced upward, stopping just below her breasts, his fingers barely grazing the soft curve of her skin. "Can I touch the view too?" he asked, his voice low and steady, carrying a weight that made her heart skip a beat.

Summer's entire body stiffened, her breath catching in her throat as his words lingered in the air. Her mind swirled, a jumble of confusion and anticipation. 'Is he serious?'

She glanced at him in the corner of her eye and hesitated, her breath catching in her throat as she nodded weakly, trying to keep her voice steady. "W-whatever, if you want," she muttered, attempting a casual tone despite the racing of her heart. "Just be gentl—"

Her words were cut short as Don's hands moved, tracing the curve of her breasts before cupping them gently. **MM~** The touch sent a shiver through her, and she bit her lip, her eyes fluttering closed as she tried to process the mix of emotions swirling inside her.

Summer's lips parted in a soft gasp as Don's hands made contact, her body stiffening for a moment before she turned her face to his, her cheeks still flushed. "Your hands are cold," she murmured, her voice barely above a whisper.

Don's gaze met hers, his eyes reflecting amusement at her words. He shifted slightly, his fingers adjusting their hold, and Summer felt a shiver run down her spine as his touch became gentler, more careful. The room was quiet except for the sound of their breathing.

Don's smile widened as he replied, his voice low and smooth, "Sorry, I couldn't help myself. Let me warm them up." With that, his hands moved, cupping her breasts once more as his fingers gently squeezed, the coldness of his touch giving way to the warmth of her skin.

Summer's eyes fluttered closed, her breath catching in her throat as she felt the sensations. She tried to push him away, but her hands lingered on his arms, her resistance half-hearted.

*Nng~** Her breath hitched as Don's fingers brushed against her nipples, the coldness there also giving way to a warmth that spread through her chest.

She bit down harder on her lip, the sting a grounding counterpoint to the waves of sensation rippling through her. **Mn~** "N-not so rough," she mumbled, her voice muffled by her hand, but Don just chuckled low in his throat, his touch easing but not stopping.

His hands moved with a gentleness now, tracing circles around her breasts before his thumbs dragged across the peaks, sending more shivers down her spine. **Ah~** **oo~**Summer's eyes remained closed, her face burning, but she couldn't bring herself to push him away.

Don's hands suddenly paused, his fingers hovering just above her skin as he pulled back, a curious arch to his brow.

Summer's chest rose with a sharp breath, the warmth his touch had kindled fading all too quickly, leaving her with an unexpected feeling of disappointment.

Her eyes flickered open, meeting his, and for a moment, the air hung heavy with unspoken things. Don's gaze roamed over her, his smirk returning but softer now, with a knowing glint.

"Oh, I see," he murmured, his voice low and teasing. "You're turned on and embarrassed."