I'm watching you. - Wait, What? (Supernatural / Lucifer)

Her mission

Lucifer had not again spoken a word about her family when she was around, but deep inside of her she knew he was torturing them. She set herself the mission to spend as much time with him as possible, because when he was with her he couldn't torture her family after all.
Knocking on the door to his throne room she waited for the door to open by itself and then stepped in.
"Well hello sweetheart. What gives me the pleasure of having you here for a visit?", Lucifer asked and tilted his head narrowing his eyes lightly.
"I... I thought you'd maybe wanna do something?", she mumbled and looked at the floor unsure.
"Oh I can't say no to such a beautiful lady can I?", the king of hell replied with a chuckle. "Drexel! Keep our guests busy while I'm gone." He ordered one of the by-standing men before getting up, walking over to Grace and leaving the room behind her.
"So? What did you think we could do?", he smirked slightly making her shrug.
"I... I thought you'd say no...", she admitted and bit her lip.
"I know what you plan to do little one.", Lucifer mumbled close to her ear after lifting her face with a finger under her cheek.
"I d-don't know w-what you're talking about....", she whispered looking at the floor with only her eyes this time as he was still holding her chin.
"You're trying to keep my entertained so I won't hurt your family.", he spoke without emotions and Grace swallowed feeling the grab on her chin tightening.
"Do you think I am that dumb? You can get what you asked for sweetheart. Let's see how fast you change your mind.", he added while stroking her cheek with his thumb.
She finally looked up watching him terrified, after all he was the king of hell and she didn't know what his torture was going to be like.
Lucifer grabbed her by her upper arm and pulled her to a room about 20m down the hallway. This time the grab wasn't gentle, but what could she possibly expect after getting him in rage?
In the room there were handcuffs on the floor and hanging from the ceiling making her breathe heavily. The memories they brought up definitely weren't good.
"Stand there.", he ordered and pointed just where they were laying and hanging.
"Are you sure you want to do this?", he asked again a smirk in his voice expecting her to chicken out especially as he had watched her before killing her family and knew how terrified she was of being cuffed.
Grace took a deep breath and nodded catching him off guard, what was pretty visible on his face.
He shrugged and grabbed her hand lifting it up to click the cuffs close are the first and soon the second before proceeding to the ankles.
"You know why your room is so close to my throne? So I can pay you regular visits.", he smiled at her. "Others don't get the privilege of being taken care of by the king himself.", he spoke and stroked her neck lightly moving a few hair strands behind her ear.
"Why don't you stop talking then and finally start?", Grace asked after getting all of her courage together and taking a deep breath.
"Oh because I enjoy you being afraid due to your little innocent head not being able to get around what I'll do to you.", he smirked and she felt goosebumps developing on her skin.
"Enjoy your stay here sweetheart. I'll be back sooner that you'd like me to."