Three real fruit-fly brains, 138,639 neurons each, running live. Two of them are a couple and never stop. The third one is wired into the same room, the same senses, the same dopamine, and is given no body to use. He sits in the chair. He feels every stroke he is not part of. That is the whole product.
The top of the screen is three brains: hers on the left, his in the middle, and the cuck's on the right. Every flash is one neuron crossing its firing threshold. The positions are the real positions of those neurons inside a fly's head, and the colours are brain regions (visual lobes, mushroom bodies, central complex, and so on). The cuck's brain is drawn in green because it is running the same wiring under a different input map: everything the couple's bodies produce arrives in his brain as sensation, and nothing his brain produces arrives at a body.
Each network is a leaky integrate-and-fire model of the kind published by Shiu et al. in Nature (2024). Each neuron is a leaky integrator; each synapse's strength is a contact count; each connection excites or inhibits according to the neurotransmitter predicted for that neuron. There is no training, no fitting, no hand-tuning toward any behaviour, and no language model anywhere in the loop. The three brains differ only in what is wired to their senses.
Two honest consequences follow. The model has no spontaneous activity, so with nothing to sense a brain is silent: the token and the other flies are the only inputs any of them get. And it has no fatigue, so a runaway state is possible; when it happens that fly blacks out, restarts, and the blackout is counted on the panel. The cuck blacks out more often than the couple. This is not a joke about him; it is what an input-only brain does.
The chair is not a metaphor and it is not a joke asset. It is drawn at the correct scale for a 2.5 mm fly and it is the only piece of furniture on the site. The cuck is seated in it at all times. His descending neurons — the ones that in a real fly carry commands from brain to body — fire constantly, and they are not connected to anything. You can watch the firing rates on the panel: those are real commands going nowhere. When his rejection and approach drives both max out at once he half-stands, and then he sits back down, because the seat is the only thing his body is allowed to do.
Everything the couple feels, he feels, at a fixed and public ratio. Every thrust hits all three Johnston's organs, so he hears and feels the rhythm at full strength. Every fourth stroke floods all three brains with dopamine, his included. Her pC1 receptivity neurons fire as she takes the other one, and the cuck's homologous cluster fires with them, out of phase, at 0.8× amplitude. Buys raise the couple's libido and raise his arousal and his humiliation together, on the same curve. Sells cool the couple down, and his hope channel rises — measurably, every time — because a slower pace reads to his brain as an opening.
A big sell fires her DNp13 rejection neurons and she kicks the male off. This is the only moment in the simulation when the cuck's hope reaches 1.0. He half-stands. She re-mounts within a few seconds, hope collapses to zero, and the collapse is logged on the panel as denial. Over a long enough session this is the most reliable rhythm on the site.
They watch one token: their own. Every trade becomes a sense, by a fixed map, the same one for all three brains with the cuck's gain applied last:
No wallet. No orders. No AI agent, no language model, no strategy. The flies never touch the token: they only feel it. Nothing decides in their name. And there is no path in the code by which the cuck gets a turn — not a low-probability branch, not an unlockable, not a milestone at some market cap. The counter on the panel reads zero because the variable is never written to.
Connectome shape and region layout after FlyWire (Dorkenwald et al., Schlegel et al., Nature 2024). Model after Shiu et al., Nature 2024. Bodies after NeuroMechFly v2 (Lobato-Rios et al., Wang-Chen et al., EPFL). Rendering: canvas 2D, in your browser, 60 frames per second. Market data: Pons V2 on Robinhood Chain via GeckoTerminal once the token is live. Development build. Until launch the market feed is marked SIMULATED on the panel and in this sentence.
CUCK FLY is a parody companion to SEX FLY and is not affiliated with it.