Sapphic book with BDSM elements (Book Unicorn #8)
For Book Unicorn category #8 of the Sapphic Book Bingo, read a sapphic book that contains elements of BDSM (bondage and discipline, dominance and submission, sadism and masochism).
BDSM encompasses an entire spectrum of activities, from blindfolds and light restraint to flogging and more restrictive bondage, etc., so pick whatever you prefer.