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Part 3 of Machine Mage Beta AU
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Seyloy Week 2026
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Published:
2026-07-25
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1,329
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1/1
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8
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Walk-In

Summary:

Beta stumbles in on Aloy and Seyka. Kina rescues the situation and everyone would probably rather just forget it ever happened.

While this is part of my long-fic AU, this can absolutely be read standalone.

Notes:

Happy Seyloy Week!

The setup: Seyka and Kina (and the rest of the GAIA gang) are living in the base with Aloy and Beta and you know about as much as you need to for this fic.

If you are trying to read this as part of the longer series, this picks up immediately following the end of Chapter 17 of "A Proving"

(See the end of the work for more notes.)

Work Text:

Beta quietly made her way from the lavatory to the common room. There were already snores from the bunk room and she didn't want to disturb anyone. Though the volume of those snores meant she likely couldn't disturb anyone without shouting.

The relative quiet of the common room at night was unsettling to Beta. Though not in a bad way, simply one that made her think. She paused partway along the wall to take in the room. Dimly lit in night mode, the only sound was the soft thrum of air from the climate control system.

The room had once seemed like a large loud space to her, even empty. Now it felt like the core of her home, resting after a day of activity. A home that she would be leaving in the morning, for only the second time since she had first escaped the Zeniths.

Beta took a deep breath to tamp down the rising not-quite-panic/not-quite-excitement that induced. Time for bed.

She continued her way to around the left side of the room, toward the stairs to the server room directly opposite the lavatories. Just audible over the barely-there sound of the air from the vents, Beta thought she heard a breathy gasp as she approached her sister's bedroom door.

The door stood open, an armor bracer laying on the threshold, preventing the door from sliding closed.

One of Seyka's. Beta shook her head, no doubt they wouldn't want that just laying there. She knelt to grab it up and stood in its place in the doorway, looking in and freezing in place at the scene before her.

Aloy was sitting right on the edge of one of the permanent desks in the room, facing directly toward the door. The huntress leaned back on her hands, arms straight, head tilted back, toward the ceiling, gasping. She was completely bare, as far as Beta could tell. Her chest and legs without any clothing, skin flushed and sweaty as she groaned through gritted teeth.

In front of her, kneeling between her legs, was Seyka, bare from the waist up, her muscular back on display toward the door. The former marine had one shoulder under Aloy's left thigh, her arm concealed from view, but her shoulder gently rocked with movement under the red head's leg. Seyka's other hand was pressing firmly on the inside of Aloy's right thigh, keeping her spread wide while she did her work. The Quen's head bobbed in sloppy synchronicity to the wet lapping sounds Beta could hear from the door.

Only a few moments after Beta found herself frozen in the doorway, Aloy's back arched and her groan turned to a full throated moan as she looked down from the ceiling.

"Sey—Beta!" Aloy's eyes went wide as they locked on her sister at the door. Her face went from flushed to pale. Beta's stomach went roiling awkwardness at witnessing to knotted up horror at interrupting.

"Mrrut, the fu—" A muffled, half formed sentence burst from Seyka as she leaned back, out from under Aloy's leg.

The instant the Quen woman's head was tilted back far enough to see Aloy, Seyka spun in place to a standing, ready-to-fight stance, standing straight and stepping over to block Aloy from any threat. Beta would have found it heartwarming if it had not been aimed at her. This end of that look was terrifying.

Seyka's eyes locked on the intruder at the door. "Beta." A pause. Her face softened. Slightly. Her face seemed to shine from nose to chin in the dim light. She wiped her right hand on her tassets and then put her arm up across her breasts seemingly as an afterthought. Probably more for Beta's comfort than her own. Beta wasn't finding much comfort in the entire situation. Calmly, but with no small amount of irritation in her eyes, Seyka finished her muffled sentence. "What the fuck?"

Beta was stunned speechless, mortified about intruding on such a private, intimate moment. She raised the bracer slightly, "This was… in the door. I'm really sorry." Still too stunned to move, she remained locked in place staring at the two.

 

 

Aloy felt the blush rising back to her face as she found herself frozen in place, staring at her sister in the door. Being seen nude, she could deal with. A moment of intrusion, she understood. She rarely had true privacy in her life until she had this room.

Possibly having to discuss with Beta what she had been doing? She did not want to contemplate that. She had no clue what education Beta even had on the subject. She wasn't sure she really had much understanding herself; she was mostly just following the guidance of Seyka and her own lust.

"Oh, uhh…" Seyka started to respond, obviously unsure about how to handle the situation. And, if past performance was any indication, probably still not thinking clearly from how… excited she got when doing favors for Aloy.

Aloy felt her low belly warming again, having had a climax moments ago. She could handle fighting off herds of machines with ease, but mix a bit of arousal in and she felt completely useless.

Things got worse. At the door, another person peeked into the room behind Beta. Kina, with some sort of snack in hand.

Before Aloy could even groan about the added audience, Kina's eyes widened and she reached around Beta to smack the bracer out of the redhead's hand and into the room and then pulled her out out and away from the door. Before the door snapped shut, Aloy heard "Have fun you two!" tossed back over Kina's shoulder.

Aloy let her forehead drop to Seyka's shoulder. "Your sister is great."

"Yeah." Aloy could feel the gentle chuckle reverberate. "Yours isn't bad, don't be mad at her for that."

"I won't." Sitting back up and shaking her head, Aloy reassured. Thinking about how to deal with it though… She rolled her head slightly on Seyka's shoulder, rather than shake it. "We'll just uh… just not talk about it. Ever."

She felt another chuckle from Seyka and a hand on her cheek, gently encouraging her up so that her lover could turn to face her.

As Aloy's brain caught up with the situation, just before Seyka's brown eyes could drag her right back into lust again, a thought occurred to her. "I may be angry at GAIA though, why didn't she warn us?" She tapped her focus.

The notification indicator flashed in the corner of her vision. "Oh."

Seyka had an eyebrow raised in query. "There are eight messages in here that I may have missed…."

 

 

"Hey, it's fine. Things like that happen when you have a home with many others." Kina reassured Beta as she guided the redhead toward the basement stairs. "I've walked in on Seyka…" She waggled a hand vaguely, "indisposed more than once."

She focused back on reassuring the obviously unsettled woman. "Neither of them will hate you for this."

Beta nodded, speaking hesitantly. "I know. I just wasn't… prepared to see… all that… physicality." After a moment, she added, "There was just so much… movement and muscle and sweat and… bodily fluids." The redhead shrugged a little uneasily.

It wasn't always like that, of course, it depended on the couple and what they liked. Rather than dwell on the topic, however, Kina offered and distraction. "I was just up here for a snack. Would you like some ice cream?"

It wasn't the same as the ice cream she'd heard mentioned in Old One's media, but GAIA had offered it as an approximation, given the ingredients they had, and Kina had made it with Alva and Zo several days ago. The whole squad had enjoyed some after meals.

Beta refused with a tight shake of her head. "No, thanks. I'd rather not have anything that involves licking at the moment."

The redhead started down the stairs as Kina frowned at her snack.

Notes:

I felt like this fit best with "The idea of home." Because home is where a sibling can accidentally walk in on you, apparently.

This might have been the first piece of Seyloy smut I ever had in mind. Obviously less explicit than some other ideas I've had (I oscillated on the rating, but figure it's on the boundary), but the idea of Beta walking in on them is just funny to me, and I feel like inevitable. It was supposed to be done in time to publish with the chapter that immediately preceded it in the main fic, but I missed that by a bit.

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