There are multiple videos of the Lanny/Kim doing each other. Both are amazingly hot, especially Lanny with her V-shaped pubic hair.

One reason they may have had an easy time doing each other is that before porn/plastic surgery they looked nothing like they did after. They each have a few pre-surgery scenes -- looking totally frumpy, not hot at all. (Pre-surgery: World Sex Tour #24 for Lanny; Lewd Conduct 13 for Kim -- Lanny looks especially dumpy). So when they do each other they see some hot fantasy chick, not the ugly duckling they grew up with.

PS One of their lesbian scenes was shot by Suze Randall, Holly's mom.
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"Is the snake OK?"