I’m assume the one riding cock is the ex girlfriend, and she’s eating the pussy of her friend. This must be ‘her’ threesome because she’s the one getting the best of both worlds.

In this position his girlfriend can’t move her head much, so there’s a danger of her choking on dick when he thrusts it deep in her mouth. Look out now.

This hardcore ex girlfriend gets banged doggy style and he seems to be doing a good job of it.