I think they have a long history and have been reunited after a long time apart. Darla is very glad to be a vampire again (after a lot of confusion post-rebirth)- therefore grateful to Dru and Drusilla is glad to have 'family' again.
There was obviously some flirtation whilst they wreak havoc but both women are still mostly hung up on Angel, in their own way.
I can't remember this episode, but I don't think vampires are any particular sexuality, they are the embodiment of 'fluid', imo, taking pleasure wherever, so I would imagine Dru and Darla were flirting with each other even if they did want Angel.
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