51. Other subs. ("Come here, Rope. Someone needs to be bound...")
52. Giant spider webs.
53. Extremely poorly-placed Portals.
54. In VR environments, Admin/Moderator Commands.
55. Accelerate the submissive's brain processes such that their perception of time seems to slow. (As far as they can tell, your quickie is hours of edging during which they can barely move a muscle. And they aren't even sore afterwards!)
56. Flex Tape (because Duct Tape is for dry people.)
57. Fortnite-style carpentry projects.
58. A hole in a wall. (Not sure how nobody caught this one yet. It's basically a staple of the genre, at this point.)
59. Magic in general.
60. Applied nanotechnology.
61. Hypnotic suggestion. ("Your arms are tied behind your back." *reaches behind their back* "Oh shit! How'd you do that!?")
62. Hair. (Rapunzel-style or Last Samurai style!)
63. Narration ("Stanley couldn't move because he was tied up. It doesn't matter how, it's my story and what I say goes.")
64. Economic incentive ("I'll give you $100 if you don't take your arms off the chair for the next ten minutes.")
65. Tentacles (Seriously, are you guys even trying? Maybe I misunderstood the prompt...)
66. Chain link fence (cuff them to it or wrap it around them)
67. Teleportation mishap (they're just straight-up harmlessly stuck halfway phased into a solid object until you let them teleport again.)
68. Contractual Obligation. ("You can move when I say you can move. Section 3, paragraph 4.")
69. Tree branches (they grew in very quickly)
70. Wax (used molten as concrete/quicksand, or fashioned into semi-soft restraints and cooled before use)
71. Magnetism (Sub is wearing armor or made of metal, or Dom has Magneto's level of molecular control)
72. Clothing (Such as a top pulled down such that their arms are pinned by the neckline)
73. Fortnite-style masonry projects.
74. Iron lung or hyperberic chamber (with wall-mounted gloves near erogenous zones)
75. Giant hamster ball (like 74 except dom can roll them around if they get too uppity.)
76. Shock collar/cuffs (Their movement isn't restrained, they just automatically get a little zap if they deviate from the position.)
77. Dough (Used like cement, or somehow baked into bread around their hands without harming them.)
78. Clay (See above, except you/they can't nibble away at it.)
79. Giant eraser (They can't use their legs if their legs have been erased. Do the mouth first, so they can't scream now that they know what's coming. It's okay, you'll draw it back when you're done.)
80. Bubble Tape. (It's 6 feet of bubble gum. For you. And them.)