I suppose she is. It's too bad she just wasn't ticklish enough to serve as a ticklee. We did try, even shot a couple of scenes, but the results were very disappointing, so I decided not to release that footage. That's part of the reason why I wasn't able to make a full video out of the Yumi footage.
In fact, to tell the truth, while Yumi's scene where she's sitting on Katrina is decent enough, I actually dropped two more scenes with her as the ticklee from that shoot because they weren't satisfactory. This is in great part due to the fact that she was sick that day, and her reactions to tickling were weakened. Nothing like the upper body tickling she received during the second shoot, and she barely reacted at all to foot ticking. Very disappointing. At least she got "warmed up" enough to have reasonably good reactions during the last scene (the chair one, again).
I tell you, that one scene with Yumi and Katrina sure cost me an absurd amount of money, since it turns out I paid them for a full shoot. Looking back, I'm not sure why I didn't negociate their salaries after seeing how poorly the shoot went overall. Definitely the most expensive 5-minute scene I've ever filmed, hands down. At least I got some good foot fetish material for a future foot video out of that shoot, so it's not a total loss. Still, while I didn't get as much footage out of the second shoot as I hoped for, the results were a lot better, and it cost me only about 1/3 the money I paid for the first shoot. Oh well, you win some, you lose some.