Nao was glowing.
Not the tired, gentle glow I'd known for years — the one that came from working double shifts and still forcing herself to smile for me. This was something brighter. Dangerous. Like someone had lit a fire inside her and she was finally letting it burn.
Every morning she'd come out of her room with flushed cheeks and messy hair, wearing one of Yuzuru's oversized hoodies like it was the most natural thing in the world. She'd catch me staring and just give me that soft, knowing smile — the same one from Chapter 2 that now felt like a secret she was keeping from me on purpose.
"You okay, Haruto?" she asked one morning, sliding a plate of tamagoyaki toward me. "You've been quiet lately."
I forced a grin. "Just tired. You look… happy."
Her eyes softened. "I am. Really happy." She reached over and ruffled my hair like old times, but her fingers lingered, almost sad. "You deserve to be happy too, you know."
The words hit like a knife.
Because I was happy.
With Reina.
And that truth was starting to scare the hell out of me.
---
I started spending every free second at Reina's house.
Yuzuru had soccer camp for three days — perfect excuse. The moment he left town, Reina texted me one word:
**Reina:** Come.
I went.
She greeted me at the door wearing nothing but a sheer black babydoll that barely covered her ass. The second the door closed I had her pinned against it, kissing her like I was drowning and she was air.
"Missed you," she moaned into my mouth, legs wrapping around my waist. "Missed this cock so much…"
I carried her straight to her bedroom and threw her on the mattress.
No talking tonight. No gentle foreplay.
I ripped the babydoll off her body, spread her thick thighs wide, and buried my face in her pussy first — licking her like a starving man. She was already soaked, dripping down my chin as I sucked on her clit and fucked her with two fingers.
"Haruto—ahh—fuck—right there—!" she screamed, hips bucking, fingers yanking my hair.
When she came on my tongue I didn't wait. I flipped her onto all fours, grabbed her hips, and slammed my cock balls-deep inside her in one brutal thrust.
"Fuuuuck yes!" Reina cried out, back arching like a cat in heat. "Ruin me—use your step-mom's pussy—harder—!"
I railed her like an animal. The bed slammed against the wall. Her fat ass rippled with every savage thrust. I reached around and rubbed her clit while pounding her, spanking her ass red, pulling her hair so I could bite her neck.
"Tell me you're mine," I growled, voice hoarse.
"I'm yours—I'm yours—I'm yours!" she sobbed, pussy clenching around me like a vice. "Only yours—cum inside me—breed me—make me leak your cum for days—!"
I exploded inside her with a roar, flooding her womb with thick, hot ropes of cum until it overflowed and ran down her thighs in messy white streaks. I kept thrusting through it, grinding deep, marking her completely.
Afterward she collapsed on top of me, both of us sweaty and shaking. She kissed my chest softly, tracing patterns on my skin.
"You're falling for me," she whispered. "I can feel it. And it terrifies you."
I didn't answer.
Because she was right.
This didn't feel like revenge anymore. It felt like home. Like the loneliness I'd carried since the accident was finally quiet when I was inside her — not just my cock, but my heart.
Was this real love?
Or was I just replacing one fear with another?
---
That same night I got home late and heard them.
Yuzuru was back from camp early. The apartment wasn't empty.
Nao's door was cracked open — just enough.
I stood in the hallway like a ghost, heart hammering, and watched.
Yuzuru had Nao pressed against the wall, her legs wrapped around his waist exactly like Reina had wrapped around mine. He was fucking her slow and deep, grinding instead of pounding, like he wanted to savor every second.
Nao's head was thrown back, lips parted, soft moans spilling out.
"Yuzuru… ah… deeper… I love you inside me…"
He kissed her neck, whispering things I couldn't hear, but the way she melted against him — the way her fingers dug into his back like she never wanted to let go — destroyed something inside me.
This wasn't just sex.
He was making love to her.
And she was glowing brighter than I'd ever seen.
Jealousy turned into something dangerous in my chest. Not just anger. Not just possessiveness. It was grief mixed with guilt mixed with this new terrifying realization:
I wasn't mad that he was fucking my sister.
I was mad that she looked happier with him than she ever had with me.
Because I had never been enough to make her glow like that.
Because my love had always been fear wearing a mask.
And now… I was doing the exact same thing to Reina.
---
Later that night Yuzuru finally left.
I was in the kitchen drinking water when he walked past me in the genkan. He stopped, looked at me, and for the first time since this whole mess started, his usual cocky grin was gone.
"I saw you leaving my house this morning," he said quietly. "Reina's car was still warm when I got back. She was… smiling in a way I haven't seen since Dad died."
He stepped closer, eyes hard.
"You're actually falling for her, aren't you? This stopped being a game for you too."
I didn't deny it.
He laughed once — bitter, broken.
"Same here, asshole. I started this for fun. To mess with you. But Nao…" He swallowed hard. "She makes the loneliness shut up. She makes me want to be better. I think I'm in love with her for real."
We stared at each other in silence — two best friends who had swapped women and accidentally swapped hearts.
The jealousy wasn't fun anymore.
It was dangerous.
Because now both of us were terrified of losing the women we were never supposed to fall for.
And neither of us knew how to stop.
---