She pisses in your mouth!

Hot, bitter liquid sprays in a jet from her vulva, across your tongue and down your throat. "Heh- hngh." Stifles the cult matron in a laugh while her black-nailed toes curl. You pucker your lips to suck around her outer vulva...

All at once, Filistra's smirk of spite fades and she starts to struggle again, but can't- "What- no, don't- hhh, auuahh!" She shrieks as you start to suck on her sex while she relieves herself: your lips pucker around her urethra, and the added section overwhelms her sensitive nerves there. You literally suck and gulp her bladder totally empty-

-and it's easier than expected. You just swallow without tasting, and it's worth it to show Filistra a smirk of your own as you raise and wipe your mouth. "You're insane! There's no way you drank it!" She howls, trying to kick her chained and levitated legs- but to no avail.

For your perversion, Filistra's cheeks darken pink in the first blush you've seen on her. She doesn't struggle as much as you lower her toward crotch-level with you... "Now that I've had your nectar, I'll plant my seed in you." You declare; you suspect she thinks Grevakhnu would consume or mutate whatever you might put in her...

... -and indeed, her expression is lax, confident you would regret that. "Go on. My offspring will destroy you utterly." She hisses back at you with a show of her lower teeth; if you could shackle her repeatedly- you could block unnatural interference in her womb.

But you aren't telling her that.