I would like to see two women, ass to ass, each inserting an end of a double headed dildo into her ass and then squeeze it between them. One girl relaxes as the other pushes the dildo into her ass, and then they switch and pass it the other way. To wrap it up it want them to compete to see who can outpush the other; starting at a neutral position the girl wins who first can push the dildo four additional inches up the other girls ass.