Find some nice CNC fiction or porn and read/watch it to prepare yourself. You can touch yourself or use your clit sucker, but you're only allowed to edge for now. It's fine if you can't. Take your time for this part.
Once you're sufficiently turned on, get on the floor. Tie your ankles to your thighs, and put a pair of worn panties in your mouth as a gag. Now insert the knotted dildo and fuck yourself with it for 15 minutes. Once the 15 minutes are over you have to keep it fully inserted. You can now try to cum, or stay like that for 5 more minutes before you can pull it out and untie yourself.
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