Supervillain Idol System: My Sidekick Is A Yandere-Chapter 558: A Busy Night (Part 10)

Don turned his head first, not toward the door, but toward Winter.

"Let’s pick this up tomorrow," he said, already moving to the door.

Winter inclined her head a fraction. No comment. Just acknowledgment.

The door slid open.

Sylvia stood on the other side with a grin. She’d changed—purple silk nightie clinging close, thin straps resting on her shoulders, fabric catching the hallway light in soft ripples as she shifted her weight.

The material hugged her hips before falling loose again, smooth, like she’d planned exactly how it would move.

She wasn’t alone.

Summer stood beside her, arms folded, posture stiff. Booty shorts in soft gray rode high on her thighs, paired with white socks pulled just below the knee. A cropped vest—dark green, snug across her chest—left her midriff bare.

Don’s gaze passed over both of them once. Then he yawned, slow and unbothered, rubbing the corner of one eye.

"What do you guys want?"

Sylvia gasped quietly, one hand lifting to her chest in mock offense. "Aww, don’t be so mean. Two pretty girls came to invite you to their sleepover."

Don’s eyes flicked back to her. Then shifted to Summer.

"I only see one pretty girl," he said evenly. "And another grumpy."

Summer’s mouth flattened. Her brow knit tighter.

Sylvia, meanwhile, smiled like she’d just been handed a gift.

She leaned sideways, resting her shoulder against Summer’s arm and lacing their fingers together. "She’s grumpy because she lost the bet on what to watch tonight," she said lightly. "A horror."

Summer turned her head sharply. "I didn’t lose. And I said I’m not scared." She tried to step forward. "Let’s just go watch already."

Sylvia tightened her grip, keeping her right where she was. She glanced back at Don, eyes bright. "Come on, Don. Are you really gonna let a couple of girls watch a horror movie alone?"

I can smell an ulterior motive, Don thought.

But the thought didn’t finish cleanly.

I’d be lying if I said I didn’t miss Sylvia...

But Claire—

"Do you really have to think about it so hard?" Summer snapped, breaking straight through his pause. Her expression was tight, annoyed, cheeks already warming.

Don lifted one shoulder. "What can I say? Seems too good to be true. I’m just checking if it’s a trap."

Summer’s eyes narrowed. "Just stay here if you want. We don’t care."

"Ouch," Don said, smiling despite himself.

He stepped back, hand lifting in surrender. "Lemme change into my sleepwear. I’ll join you in a bit."

Sylvia let out a quiet, pleased sound. "Yay," she murmured.

She released Summer’s hand and leaned closer to Don, just enough to press lightly against him. "Feel free to come in just your briefs..."

"Hey!" Summer snapped. "What are you whispering?"

Sylvia leaned back immediately, looping her arm around Summer again and tugging her away from the doorway. "Nothing, nothing. Just telling him he’ll find us in your room." She gave Don a look over her shoulder. "Now come on."

Summer glanced back once as they walked off, chin lifted. "Hurry up," she said. "Or we’ll start without you. Hmph."

There was a faint blush on her cheeks by the time the hall swallowed them.

Don exhaled through his nose.

I guess I could use a little distraction.

With that excuse firmly in place, he turned back inside to change.

A few minutes later, Don stepped into Summer’s room.

Pajama pants, dark and loose. A plain black vest clinging to his torso. Socks padding his steps as the door slid shut behind him with a muted click.

The room was dim, lit mostly by the projected screen on the far wall. The movie was already playing—flickering shadows crawling across the surface, sound low but present, background noise filling the space.

Summer sat cross-legged near the center of the bed, hugging a pillow to her chest like a shield. Her eyes stayed locked on the screen.

Sylvia lay on her stomach beside her, chin propped on a pillow, feet idly lifting and lowering behind her.

She turned her head when Don approached. "Welcome, big guy."

As he reached the edge of the bed, she looked him over openly, smile slow. "Summer wasn’t kidding," she added. "You got bigger."

Her gaze drifted, unashamed. "Did you get bigger in any other places?"

"Can you two shut it and focus on the movie?" Summer said, hugging the pillow tighter.

Don spread his hands. "I haven’t even said anything."

Sylvia patted the space between them. "Middle," she said. "You can share my pillow."

Don climbed onto the bed and did exactly that—lying down with Sylvia to his left, Summer to his right. The mattress dipped under his weight, the frame giving a soft creak~ as it settled.

Summer stayed cross-legged, eyes forward, jaw set.

Sylvia shifted closer, adjusting the pillow beneath her chin, content.

The screen flickered on, sound rising just enough to pull them in.

The movie droned on—some cheap jumpscare flick with too much noise and not enough substance—but Don barely processed it.

Sylvia had been shifting for the last five minutes, restless, her thigh pressing warm against his. Then, with a slow, timed roll of her shoulder, she let the strap of her nightie slip a little.

It didn’t fall. Just hung there, teasing, the purple silk dipping just enough to expose the soft swell of her breast. She tilted her head toward him, lips parted in a lazy grin, and arched her back slightly.

Sylvia exhaled softly, her breath warm against Don’s neck. "It’s kinda chilly in here, don’t you think?"

Summer barely glanced over, arms still wrapped tight around her pillow. "Not really." She squinted at the screen where some poor idiot was stumbling through a dark basement. "Want me to turn up the heating?"

Sylvia’s fingers slid slowly over Don’s knuckles, her thumb tracing idle circles. "No," she murmured, pressing closer. "It’s fine. I’m warming up thanks to Don here."

Summer rolled her eyes. "Whatever."

Sylvia’s fingers curled around Don’s wrist, guiding his hand with slow insistence. Her palm was warm, damp with a thin sheen of sweat, as she pressed his fingers against the silk of her nightie.

The fabric slid down with a whisper, pooling just enough to bare the soft swell of her breast—pale skin flushed pink, the peak of her nipple already stiff under his touch.

Mm~

Her breath hitched as his thumb brushed over the sensitive bud, circling it in lazy, teasing strokes. She arched slightly, pressing into his hand, her lips parting around a low, satisfied hum. "Yea... definitely getting warmer."

"Eep—!" Her whole body jerked, back arching instinctively as the pillow tumbled from her grip. The sudden warmth of his touch seeped through her, sending goosebumps skittering down her arms.

Her vest rode up, exposing more of her toned stomach as she twisted slightly, finally looking at him with wide eyes.

"W-what the hell—?"

"Wow, getting scared already?" Don smirked, fingers kneading the soft curve where Summer’s booty shorts met bare skin. The thin fabric of her panties bunched under his grip.

She huffed, shoulders stiffening—but didn’t pull away. "Shut up," she muttered, though her hips tilted just slightly into his touch.

"Don’t worry," he murmured. "Your big bro will keep you safe." His thumb hooked under the waistband of her shorts, dragging the elastic down a fraction, the heat of her skin searing against his palm.