Chapter Text
A narrow bathroom connects Gem’s bedroom to Scar’s. Two sinks are set side-by-side in the counter, with a long mirror on the wall behind. A sliding door separates the toilet and shower from the rest of the room. And the doors leading into their bedrooms have no locks.
Not that it matters much. They never shut them anyway.
Why bother? Their bedroom doors are already closed to the hallway, shutting out the chaos of the rest of the house. With their mom and stepdad too busy wrangling the little ones to pay them much mind, their two rooms—and the bathroom connecting them—are a space that belongs only to Scar and Gem.
From his bed, if he lays on his side, Scar can see straight through the bathroom into Gem’s room. He’s always found a certain comfort in that; as a kid, after their parents decided he was too old for a nightlight anymore, he’d only have to roll over to see Gem’s sleeping face in the next room, illuminated by the gentle glow of her nightlight.
He catches glimpses of her changing clothes, sometimes. It never used to be a big deal—he’s sure she’s seen him changing just as often—but ever since he first noticed her chest was… developing, it’s become kind of a whole thing for him. He’s had to slink off to squeeze one out in the shower more than once after seeing her topless.
Scent, of course, passes easily between their rooms, too. Scar has always thought that Gem smells rather nice: her scent is light and sweet, like nectar or fresh fruit. It’s so familiar to him by now that it hardly even registers to him anymore.
Or at least, it shouldn’t. But lately, there’s been an undercurrent to the way she smells, something a little more tangy. Something almost… tantalizing.
She’s pack; she’s family. That’s all she should smell like to him. But Scar can’t help the way his body reacts to her scent. It’s confusing, and frustrating, and more than a little inconvenient.
And then everything clicks into place on the morning when Gem gets her first heat. The smell of it slams into Scar before he’s even opened his eyes. His dick is already straining against his boxers by the time his brain catches up enough to recognize what’s going on.
Gem’s standing in their shared bathroom in her tank top and sleep shorts, brushing her teeth at the sink—a normal enough scene, if not for her scent. It’s so thick in the air Scar can taste it, lush and enticing and insistent on his tongue.
He pads into the bathroom behind her. “You can’t go to school smelling like that.” She’d be alpha-chow in seconds.
Gem spits out her toothpaste and looks up at him. Her eyes are huge. “What do I do?”
“I…” You can break a heat, right? With sex? Orgasm, maybe? His mind feels foggy, full of nothing but the sweet, rich fragrance of Gem’s heat. Distantly, he thinks there may be something about knotting or mating bites, too, but he can’t go that far. Not to his own sister. “Here, just—take your PJs off. I’ll help you.”
That’s all it is. He’s just gonna… help her out a little.
As easy as that, Gem drops her shorts to the floor. Scar can’t resist running his hands over her sides; her skin is flushed and warm to the touch. He can feel himself buzzing with want already.
“Lean on the counter.”
Gem does, and Scar sucks in a breath. Her pussy is swollen and pink and dripping with slick. Technically, he’s seen this much of her before, in passing—but he’s never been allowed to really look, never like this.
Scar pulls his boxers off. They’re already sticky with precome. He can see Gem watching him in the mirror, and he shifts to the side to make sure she’s got a clear view of his reflection. He gives himself a couple good warm-up strokes, and a thrill goes through him when Gem’s eyes flick down over his cock.
“This’ll help?” she asks, spreading her knees further apart.
“Think so.” Scar glides the head of his cock between her folds. Before he can even ask if she’s ready, Gem pushes back against him, and Scar jolts when he slips inside just like that.
She’s really so unbelievably wet. It’s like he’s melting into her.
Gem groans and drops her forehead against her arms.
Scar pulls back and pushes in again, watching with fascination as his cock disappears back inside of her. Her slick walls pulse around him, and he has to lean forward and brace his arms against the counter on either side of Gem’s body just to get a hold of himself.
As slowly as he can manage, he starts to rock his hips. He feels like all the nerves in his body are tuned in to everywhere his skin is touching hers. The warmth, the squeeze, the thrill—it’s driving him wild. He doesn’t know how he’s ever gonna go back to just his hand after this.
“Scar,” Gem moans weakly. Scar has to bite his lip to keep himself from coming at the sound of his name. “Can you go faster?”
“You got it,” he pants, and speeds up. The wet slap of their hips echoes off the tile walls, and a giddy, drunk sort of feeling takes him over.
His knot bulges and hardens at the base of his cock. He feels it smacking against Gem’s pussy with each thrust. A tiny burst of pleasure jolts through him each time they come into contact, promising warmth, promising bliss, if he’d only snap his hips forward just a little harder.
She could probably take it. He wants her to take it. But with every ounce of self-control he has left, he holds back, refusing to push it inside. He’s not going to knot her. He won’t.
Gem’s breathing is quickening. Scar glances down and realizes her legs are quivering. She raises herself up to her tiptoes, lifting her hips as high as she can, and suddenly the angle is much deeper. The head of his cock is dragging against her walls in a new way—and then Gem’s gasping, and whimpering, and clenching—
Scar’s orgasm hits him like a punch to the gut. He presses himself along Gem’s back and buries his cock deep inside of her as he rides out the wave, shuddering as she continues to flutter around him.
When he comes back to himself, realizes that Gem’s scent is changing. The smell of heat-pleasure-need fades away, leaving only the pleasant scent of Gem-omega-sister.
He pulls out.
Scar watches the reflection of his bare chest rising and falling—he’s breathing just as hard as she is. His gaze flits between the flush on her cheeks and the come leaking out of her slit. He feels dazed, and more than a little pleased. That’s his handiwork.
“You were right,” Gem pants, looking up to make eye contact with him in the mirror. “That definitely helped.”
“Told ya.” He grins and flicks the back of her head. “Now let’s go make breakfast.”