Twelve Maxbridge Street
by M H Keplar
This is Dark Erotica. There is a little romance in the last chapter, but it is not mainly a romance.
A young straight executive signs up for a night of pain and sexual humiliation at the hands of the men and women of The Association. He experiences what was promised and more.
This book has been called "old school" and "in the vein of French Erotica." If you think this might appeal, you may enjoy this highly explicit short story.