Two scenarios came to mind about Erza's scene in the Tartaros Arc so I wrote both:
(possibility 1):
"How very lucky you are, Ms. Scarlet. It seems like I won't be able to have my fun with you." stated a masked woman with spikes protruding from the side of her head. However that was not the strangest thing about her, most would say that that would be the talons she has for hands and the claws she has for feet. This woman was no human, she was Kyouka, one of the nine demon-gates of Tartarus, created by the black wizard himself.
"What do you mean, and where's Mira!?" Erza demanded.
"Our master wants the information as soon as possible and because of that I can't do what I had planned." she said, motioning to the chains that held the naked scarlet beauty and ignoring the other question about her comrade.
"What information are you talking about, I don't know what you could want from me?"
"Oh don't play coy dear, though it is a shame that I can't force the information out of you myself, we have other means. Sayla!" she called, shouting so the woman could hear her.
A few seconds later a golden-horned woman wearing a beige kimono walked into the room."Are you done, Master wants the information as soon as possible."
"Yes, I'm done, but if you need help, don't hesitate to call, I've always wanted to break such a strong spirit."
"Actually, if her will is as strong as you say, can you go and acquire plan B?"
"I'd be glad to." With that, Kyouka left to get the mysterious plan B.
"Now then," Sayla's eyes changed from looking at Erza with interest to look at her as if she was prey."you will answer my question." Erza felt a wave of power come with those words. "Where is the location of Jellal Fernandes?" Erza immediately bit her tongue with as much force as possible to keep herself from saying anything, that question almost made her give away the position of one of her childhood friends. "So Kyouka was right." Sayla stated, not sounding surprised at all "your will is extremely powerful" the door of the room clicked open "but can you stand by while your friends suffer?" Erza was about to ask what she meant before she heard the door opening.
Kyouka walked back into the room and threw plan B to the floor."Let's see if you can withstand your friends getting tortured in your place." On the ground was a bloody and beat up mess of a Dragon Slayer, Natsu had dozens of shallow cuts all throughout his body, along with one of his arms being bent the wrong way.
"Kyouka, did you really have to break his arm to bring him here?" Sayla asked, truly wondering her fellow demon's reason behind doing so.
"I was taking him from his cell and the sliver haired girl you caught tried to stop me, I hit her to the ground and then he started to struggle, it was annoying so to shut him up I increased his pain sensitivity and broke his arm to knock him unconscious." Kyouka drawled, as if the answer seemed obvious.
"Well I suppose it doesn't matter, if Scarlet doesn't comply then he'd have suffered through that anyway."
"What the hell are you talking about, why are you doing this?!" Erza screamed.
"I told you, we need the location of Jellal by the quickest means we have. From what we've gathered you won't let your friends be harmed if you can stop it, and you can if you tell us where he is." Sayla then stomped her foot on Natsu's chest, cracking the ground beneath him, waking him up and making him cough blood. "Now then, has that jogged your memory?"
"Stop it, I'll tell you just let him go." Sayla removed her foot from Natsu's chest.
"I'm glad you could see things our way."
"Jellal is at-"
"Don't do it, Erza!" Natsu screamed from the floor. "That bomb-guy I beat up bragged about his plans, they want to find Jellal so they can kill him and activate a bomb to destroy our magic, you can't let the-AHHHH." His broken arm was shattered even worse by Kyouka.
"Oh no, your friend just hurt himself. You can stop it by telling where Jellal is." the irritation in Sayla's voice was steadily rising.
"I'm sorry Natsu I have to, he's at the-"
"If you tell them, then when our friends come to save us, I swear on my life I'll burn off my guild mark and make sure no one ever finds me, don't put me in front of all the magical world, Erza!"
"Natsu..."
"God damn it, shut up and stay of out or way!" Sayla snapped, kicking Natsu into a wall, finally rendering unconscious once more.
"Now Ms. Scarlet, what is your decision?"
"I...he..." Erza faltered 'I'm sorry Natsu, I can't stand watching you like this.' "Jellal... he is..."
(possibility 2)
"Where is Jellal Fernandes?"
"I don't know."
"What!?"
"Why do you think I would know, he's in an independent guild that has a primary objective of destroying anything to do with Zeref, while also being targeted by the magic council, at most he would stay somewhere for a few days then leave, and that's when he's close to society. I can't know of his whereabouts every second of the day.
"Wha- but you were his love interest." Sayla uttered, shocked by this turn of events.
"No way, he's like an older brother to me now. Did you think that because I had a crush on him when I was a child that I would retain those feelings years after he tormented me, went to prison, and tried to sacrifice my life?" Erza asked rhetorically.
"Kyouka, cancel plan B, she doesn't have a clue where he is. Just take her to the cell with the others."
(not sure how to end this so this is the end.)
