As you can see on the cover there are four scenes but javlibrary only lists three actresses.
Not 100% sure, but I think the one you're looking for is the 4th one, Rion Nishikawa (西川りおん). Check for yourself on this cover of SERO-234, as I haven't seen tha actual SW-207 movie and it's hard to be sure from just the two pictures you posted.