I must support the bobbler comment :D :D :D;D
How about some hair pulling action? Or kissing while in this pose? Also a spanking and an anal option would be nice for the from behind pose. Another option, how about pushing her up against the wall for this sex pose instead of using a table or chair for her to balance on? Pull out and squirt on her backside for the finish would also be a winner.
Mmm,..taken from behind pressed against those glass windows? :P