I don´t know if it has been used elsewhere , at least I have not see it consciously before :
This deck chair ( or whatever it is called ) is so helpful because the feet can be nicely seen , better than on a sofa or a bed as in other scenes ! Its 2 or 3 parts can be manipulated according to the height and the needs of the model , so that the double-doggy airtight results as smooth as possible and then the whole body ( + feet ! ) can also be seen . Very smart idea .
( Airtight is not seen on the pic , but it happens during the scene . Since it was a 5on1 there existed the possibility to let her do a DBJ or a triple bowjob , but I hope to see this combination in the future ... )