Gags!
Depending on the lee, a gag can provide a delicious mmmpphhhh whenever you are tickling her soft soles. Moans and grunts are sexy.
Tape gags have that sinister look but provide pleasure to the Ler or Captor (consensual, of course). A silver tape gag looks delicious on a bound and gagged blonde or a white one goes well with any pretty girls, but can restrict breathing.
A cleave gag (scarf between the teeth) is ideal for tickling because the lee can still breath normally and laugh. You can still see their pretty smile, even though the poor damsel can't talk.
A ball gag, a favorite among us bondage enthusiasts, can be very sexy but also can limit breathing, but not as much as the tape gag. Occasionally, the lee can open their mouth to breath, but also causes drooling.
In any situation if gagging a lee, I wouldn't ever leave them bound and gagged alone for a long period of time, in fact don't, and ALWAYS agree on a safe word or signal. Play safe, for Cliff's sake!
This is Cliff, btw.