If the passive (bound) partner is permitted to orgasm, it may be more intense than usual due to the extended stimulation and resulting build up of tension and arousal. Alternately, the bound partner may be completely denied orgasm and left in a state of sexual frustration.
More About Tie and Tease
Because tie and tease play involves restraint and helplessness there should be negotiation between partners before play begins. The physical and psychological intensity of the activity may require negotiations to include discussion of emotional as well as physical safety.