Hmm. You're lucky it's your thighs that expand. I tend to expand in
the waistline, and I also have very short legs. The combination of big
belly plus short thighs equals no lap.

Doesn't seem to be a big problem, though. When I'm on the computer, the
kitties just curl up on the desk, between me and the keyboard. I have a
regular-sized desk, not one of those dinky "computer tables", so lots of
surface area. Plus, of course, there is now the flat-panel monitor, so
now I have even more space. And when I'm couch-surfing, I semi-recline
against the arm-cushions and curl my legs under. This exposes much hip
and thigh area for kitties to meatloaf on.

Sometimes I even get Smudge on my thigh and Roxy on the side of my waist
and onto my chest. This works fine as long as Roxy's facing toward my
head. But she often likes to turn around and stick her butt in my face.
In that situation, this puts her nose-to-nose with Smudge, causing an
inevitable squabble and stalking-off of at least one of them.

Joyce