A
Princess with a borrowed Knight is a different dynamic because, as
there is no relationship between them, the borrowed Knight is very much just the sensual and
sexual plaything of the Princess.
Having a borrowed Knight is the ultimate indulgence for a Princess.
A Princess with a borrowed Knight is free to do whatever she wishes as long as
what is done remains within everyone's limits. Of course this includes
not going as far as the limits allow.
A part of Devotional Sex being fully consensual is that a Knight can set limits for what his Princess is allowed to do with other men. If such limits have been set, a Princess with a borrowed Knight is duty bound to stay within these limits.
Devotional
Sex is only successful if everyone involved enjoys it enough to want to
continue its practice. Thus a Princess with a borrowed Knight has a
responsibility to ensure that her borrowed Knight enjoys the experience
enough to want to do this again.
Knight swapping or
lending can be used to give someone new to Devotional Sex a fun
practical lesson. An experienced Princess can educate a new Knight, or
an experienced Knight can guide a new Princess. 
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