Slightly kinky character rambling
Penny is very soft, and probably has a body that's like non Newtonian. Plush and pliable and you can literally sink ino them. Very very light and airy but also thick and dense feeling. Penny doesn't weigh much, but being engulfed by them or flopped on would be like getting buried by aerogel mixed with a synthetic fiber featherduster. You could squeeze them so much and they just bounce back
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Slightly kinky character rambling
Squeeze your hands into Penny. Soft, but very staticy fur like touching a crt screen. They're like squeezing a gel cushion first, then you start sinking in and sinking into their body. Squeeze squeeze soft smooosh uh oh too much squeeze now PENNY gets to keep you!
Slightly kinky character rambling
Or big Penny. Beans go WHUMP ultra dense-plump-soft but gotta smoosh slow foe the soft to show.