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In settings like a high-speed transit system or a subterranean colony, physical space is at a premium. Storyline:

The term "tube" refers to the hollow curl of a wave (barrel) or, metaphorically, any enclosed, high-risk natural formation (ice caves, river holes, avalanche chutes). An "extreme tube relationship" thus involves two people whose bond is forged, tested, and often nearly broken inside life-threatening, immersive environments. extreme transex tube full

She climbed aboard. Her body was a line of heat against his spine. For the first hundred meters, it was mechanical. He counted the g’s. She counted the thrum of his heartbeat through two layers of armor. In settings like a high-speed transit system or

“And now?”