Spend one hour completely naked and tie your tits in a tight harness for the first quarter of it. Before you free your tits, massage them for a minute, then lay down on your belly and try to make yourself cum. If you do not manage to cum within 10 Minutes you won't cum at all during these 4 days.
After you came or the 10 minutes are up, release your tits, kneel down in front of a mirror and look at the rope marks you created until the hour is over.
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