I don’t know if I’ve really had to “safeword”, but the first time I was tickled by fellow tmfers the deal to make it stop was to say “please don’t tickle me, I’m a very ticklish person”... I think I did it about a minute in. Oops lol.
Magic wand adapter for your dick. I only used the face word because it made me cum in 20-ish seconds. I didn't know that part could even be so ticklish.