I did it, but the guy was not in her ass but in her pussy, my tongue being closer to the balls of the guy. Sometimes he removed his dick from her pussy, letting me insert my tongue in her pussy, it was a fantasy of mine.
Is there anytihing better than fucklicking while she is being assfucked and sucking your cock at the same time? Great view and if lucky the cum in her ass will spill into my mouth too!