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saintsugu · 6 months

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DON’T BE SHY! KINKTOBER DAY 4

rating: mature; explicit mdni

pairing: sae itoshi x fem!reader x rin itoshi

wc: 2k

content warnings: explicit sexual content, cuckholding, vaginal penetration, dub-con (on Rin’s end), Rin’s extremely drunk, established relationship (with Sae), sadism, vouyersim, alluding to cum eating

Rin Itoshi has always had a crush on you. Even dating back to the junior prom, you remember the way his eyes lingered on you and his elder brother for a little longer than they should. He has never been outward in his feelings, yet you’ve always been able to tell.

You found his schoolyard crush on you…cute. That was the only word you found to describe it. It was quite easy to toy with him, too. He’d jump at the slightest touch, or blush wildly if you complimented him in any way, shape, or form. That being said, it didn’t take long for your boyfriend to pick up on it either.

Sae, even with all of his flaws as his sibling, has always been in tune with his younger brother’s feelings. If he was being entirely transparent, he’s known about Rin’s feelings since before he asked you to be his girlfriend. Objectively, it was a bit shitty of Sae to do, but it wasn’t his fault Rin didn’t have the courage to ask you out. If someone were to do it, it’d be better to keep it in the family, right?

With your birthday around the corner and one year anniversary with Sae within the same week, your boyfriend graciously planned a trip to celebrate both events. The trip included not just Sae, but all of your close friends as well— Rin especially. The entire idea was fun and exciting and yet another experience you had thanks to your boyfriend who had money to spare. Then Sae had another idea that sparked your interest.

—

“Where are we going?” Rin asks anxiously, annoyance thick in his voice. He’s already drank more than he should’ve, so he’s on edge as Sae drags him through the hotel’s halls.

Sae simply brushes him off with a halfhearted— “don’t worry about it.” To truly showcase his point, he yanks Rin’s wrist even harder as he stomps towards his hotel room. Sae’s refrained from indulging too much tonight. Nothing liquor could give him would ever be worth missing out on the chance to savor these moments.

Scanning his keycard, he easily opens up the door to reveal a dimly lit hotel room. He kicks his shoes off, dragging his brother inside and letting the door shut heavily behind him. Rin is beyond confused, still processing where he is and why Sae dragged him here so urgently. He’s still sluggish when he cluelessly follows Sae deeper into his hotel suite. His incessant questioning continues, but Rin freezes in his tracks when he reaches the bedroom.

“Hi, Rinnie.” Your voice is sweet like honey from where you sit on the edge of the bed. Soft skin is decorated in a pretty lace fabric— a birthday present from Sae, and one you decided to debut tonight. It leaves very little to the imagination, and the garters that cuffed tightly against your thighs drive both of the brothers crazy.

Rin’s eyes dart between you and his brother. He feels like he interrupted something despite Sae physically dragging him in. His body won’t move, but his mind is too preoccupied to even tell it to. “What…is this?” His voice shakes.

His brother snarkily raises a brow, sauntering over towards you as he sets a territorial hand over your thigh. “What does it look like? ‘M being generous, clearly.” When Rin fails to come up with a response, Sae just scoffs. “Take a seat.”

With this all pre-planned, there’s a soft chair set up with a perfect view of the bed, and Rin hesitantly makes his way over to it. As soon as he sits and gets a better view of you, he feels his pants tighten up a bit. He had noticed that you had slipped out from festivities a bit ago, but he would’ve never guessed it was for a reason like this.

“What do you want me doing?” He hates how much his voice is quivering but with the alcohol in his bloodstream, he’s having a hard time wrapping his head around what’s taking place.

“Nothing at all, Rinnie,” you reassure him, watching the way his features soften at your tone. “We just want you to watch. Is that okay?”

Drunken and dazed, he starts to nod. He barely even knows what he’s agreeing to, but what he does know is that you look amazing and he’d be a fool to let this chance slip away.

“Watch and learn, baby brother.” Sae’s words are filled with malice as he sets a knee on the bed, mattress dipping down as he leans in to kiss you. With your eyes fluttering close, he keeps staring back at Rin.

You hum softly against your boyfriend’s open mouth, a bit drunk yourself as he starts to palm your covered tits. Eventually, after Sae’s drawn out his point, he descends towards the ground. He trails kisses down your body, starting at your neck, and then your sternum, until his knees press into the carpet, and he’s faced with your cunt.

The driving factor in buying this pair of lingerie was the fact that it was crotchless. He found the name of it a bit grotesque, but the functionality of it was incredible. This way, you can’t reprimand him for ripping your panties when he gets too impatient— which he does, a lot.

He almost gets so caught up in tasting you that he forgets you have an audience. Once that crucial detail does hit him, though, his hands come up to spread your legs even further as his tongue pushes against you.

“Feels good…” your breathy moans fill the air, unable to pull your eyes away from the couch as Rin palms at his cock. It feels dirty and cheap, but he can’t help it; not when you’re right there making those noises. It’s better than anything he could’ve imagined—anything he did imagine.

“‘S okay,” you tell him, noticing how reserved his movements are. “You can touch yourself, Rinnie. Don’t be shy, I don’t mind.”

That’s all he needs to hear for him to undo his belt.

He feels overtaken by lust as he undoes his belt and dress pants, hand slipping underneath the band of his boxers within a second. He lets out a deep groan— one that turns you on more than it should; especially when his brother is the one tongue fucking you right now.

Even with Sae’s tongue buried deep inside of you, do you find yourself humping against his face, but having your eyes glued to his baby brother.

What started out as purely lust in Rin’s mind has now morphed into a different feeling. Jealousy had planted itself deep into Rin’s brain. It’s always been there, no matter how much he’d like to act the opposite, he’s always envied Sae for doing what he couldn’t; for making you his while Rin stood off on the sidelines.

Fuck, he wishes it was him right now, kneeling beneath you. He could treat you so much better. He might not be as experienced as his brother, but he knows he could please you. It can’t be hard, not with the way you’re gripping Sae’s hair and moaning like a whore. God, why can’t it be him? Why does he have to sit here and watch what he can’t have? Why does he…feel like he’s about to cum?

“S-Sae,” you whine, trying to tug him off. You don’t want to finish like this. You want— no, you need something inside of you. Especially after you’ve been staring at Rin’s cock for so long. Shit, it really makes your mouth water.

Sae doesn’t need any further explanation to know what you want. With one last lick, savoring the taste of your essence, Sae stands up and glances over his shoulder. He nearly laughs at how pathetic his brother looks getting off at the sight of his brother pleasuring the woman he’s in love with. Could you really get any worse? It truly fuels that sadistic part of him.

He repositions you with ease, getting you on his lap so that Rin still has a great view. Considering how soaked you already are, Sae doesn’t even attempt to be gentle as he pulls you down onto his cock. He loves the way you thrash in his hold, nails scraping into his forearms as he keeps you in place. There’s a reason he always pays to get your nails done and it’s definitely not just because they look nice.

“Shit,” he curses, his hot breath on your neck as he sucks on the skin. “Squeezing me so fucking tight, doll. If I didn’t know any better, I’d say you’ll be creaming pretty soon.”

“N-no,” you shake your head, eyes squeezed tight as you try to adjust to his length. You can always feel so much of him in this position. His cock is fully nestled inside of you and it drives you insane.

“Not gonna cum yet…” your eyes flit between your boyfriend, and then his brother who is on the verge of climaxing. You want to make them both crazy, and you know just how to do that.

“Not without your permission, Sae.”

It evokes the exact reaction you wanted. Jealousy surged through both Rin and his brother, and that’s evident in the way Sae’s speed picks up, as well as Rin’s hand. Their groans fill the room, teeth grit and jaw clenched. If you had ever questioned how similar they were before, this answers it.

As Rin lets the alcohol get the better of him, words are spilling out before he can stop them. “C-could treat you so much better,” he stammers, hips jerking against his hand. “Could fuck you so much better.”

A lopsided smile finds your lips, egging him on to the best of your abilities; although, that’s hard with Sae jackhammering you the way he is. “Yeah? You think so, Rinnie?”

“Fucking know it,” he nearly growls, jealously only fueling his oncoming orgasm.

Sae’s not much better, honestly. Hearing his brother’s pathetic whines of how much better he could treat his girlfriend, has his eyes rolling. At the end of that day, you’re his. No matter what Rinnie thinks, Sae’s gonna be the one fucking you for hours on end, and that thought makes him want to stuff you full.

With Sae’s hand slipping down to pinch your clit, your back is arching as a whiney moan of Sae’s name leaves your lips. The entire sight is something straight out of a porno, and it has Rin gasping as well. Nearly simultaneously, the two of you reach your highs, and in turn, the way you tighten around Sae’s cock has him tumbling over the same hill. With a deep thrust, he’s stuffing you full of his cum just as he wanted.

The room is filled with the melody of all your moans mixing together, as your highs peak and you begin your comedown. Rin’s hand, as well as some of the floor, is painted white, and Sae’s cum has begun to drip down onto your inner thighs. It’s all messy, and gross, and insanely hot.

“Fuck, baby,” Sae groans into your neck, nibbling at the supple skin as he rubs your hips. “That was so fuckin’ hot…”

You only giggle, his lips feeling ticklish against your skin, and you redirect your lidded gaze towards the boy in front of you.

“Rinnie,” you tease in a song-like manner. “Still with us?”

He groggily says yeah, still in a haze from both the alcohol and his orgasm that seemed to wipe him out. He’s starting to come to, but that means the shame is also beginning to settle.

What just happened doesn’t really make sense to Rin. Not only did he watch his brother fuck the girl he’s been in love with for half his life, but he got off to it too. It makes him feel guilty, and disgusting, but god, he can’t deny how good it all felt. It was like torture, but he’s also never cum that hard before.

“Rin,” Sae calls him, voice stern and making the man look up immediately. As thick hands spread your thighs apart, you find yourself moaning softly from sensitivity. Now, though, his cum starts to drip down even with Sae’s cock still inside.

“Come clean her up.”

taglist: @dgrymn @kkittycries @saintriots @dilfhos @pussydrunkfyodor @enchantedforest-network @themovingcastlez

#bllk x reader #blue lock smut #rin itoshi #sae itoshi #sae itoshi smut #rin itoshi smut #blue lock x reader #sae itoshi x reader #rin itoshi x reader #bllk #blue lock #.kinktober 2023 #.ezra’s writing #.file } sae #.file } rin

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