Durge/Gale (or both 👀) is captured by Gortash who decides to test his newly developed drug on them. The drug turns out to have a powerful aphrodisiac side effect. Now Gortash refuses to give Durge/Gale any release unless they beg him for it.

+Gortash very much enjoying having power over a Bhaal's Chosen and spawn/Mystra's former Chosen and lover and reducing them into a desperate mess. Maybe the drug was developed for anti-magic/anti-bhaalspawn purposes but had some major side effects
++ Multiple orgasms + some humiliation. Maybe he marks them with how many orgasms they've had.
+++Gortash has to bring out some of his "toys" when he gets tired (or finally lets his two prisoners go at it while he watches)
++++ Gortash taking notes for his new drug