Lots of close up shots of ass in the later half of the scenes in In the Crack. I love the tease which usually includes loads of ass worship in the first half of their scenes, the second half with the closeups of pussy and assholes is less to my taste but sounds exactly what you're looking for. Nothing extreme either, which is nice.
You may also want to check out Buttman's Stretch Class which also has great tease and ass worship and then moves to closeups of assholes and toyplay.
In terms of lesbian ass licking there was a great series that Dana Vespoli did for Filly Films I'd recommend.

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