Tiffany woke up with the sensation

Tiffany woke up with the sensation of being unable to close her mouth. She opened her eyes and flinched slightly at the sight of Taeyeon on top of her, and wearing a strap on.
Tiffany tried to get up only to find out her hands were handcuffed behind her. She moaned and mumbled trying to tell Taeyeon to let her go but Taeyeon couldn't understand.
"Shut up"
Tiffany didn't listen. She struggled because she had a feeling she knew what Taeyeon wanted. Because of Taeyeon's position, kneeling above her head with the strap pointing towards Tiffany's mouth, it wasn't hard to figure out. Tiffany was afraid that Taeyeon was going to make her gag again. Last time it was horrible and she was convinced she would throw up. But she couldn't do anything about it now could she?
"We're testing out two new toys today Tiffany! The first is the gag in your mouth. I don't know whether you've noticed, but it isn't a ball gag. Its something called a ring gag. It holds your mouth open like the ball gag does but it has a hole in the middle so I can do this.
Taeyeon shoved the through the hole and deep into Tiffany's throat. Tiffany gagged and tried to shake her head so the would come out, but the gag wouldn't allow it.
Tiffany's tears dropped as she tried to control her gag reflex. Taeyeon pulled out only for Tiffany to cough and splutter.
"The second, is this beauty" Taeyeon looked down at the strap on with a grin on her face.
"It's nine inches." Taeyeon said with a wink.
Tiffany widened her eyes at the size of the thing. Would it even fit inside her?
"Oh and it does something else too but that I'll save for later" Taeyeon winked again.
She put the in Tiffany's mouth again and moved her hips back and forth ignoring her girlfriends spluttering. The went in and out being coated with Tiffany's saliva as it did so. The position was getting awkward for Taeyeon now so she pulled out of Tiffany's mouth and grabbed her hair forcing her up and into a sitting kneeling position. ( sitting on top of her legs).
Taeyeon kneeled and positioned herself in front of Tiffany's mouth. She led the to the hole in the gag and began thrusting. Everytime the hit Tiffany's throat, the on Taeyeon's side would go deeper. She then remembered something. She grabbed the remote from the bedside table, keeping the in Tiffany's mouth as she did so. She brought it in front of her face, still thrusting and pushed a button which immediately caused vibrations in Taeyeon's .
Taeyeon groaned at the feeling while Tiffany was feeling no pleasure at all. She was trying to breathe in between thrusts but it was hard, especially with her excess saliva blocking her throat and flying out of the gag, running into her nostrils and coating her nose.
She whimpered but Taeyeon was none the wiser. Her eyes were closed while she focused on the feeling inside her. She thrusted harder as she felt her approaching. The speed that the was hitting Tiffany's throat, plus all the saliva in her mouth was making a satisfying sloshing sound. Accompanied with Tiffany's hard gagging sounds and vocals being cut off every time the hit her throat, it added to Taeyeon's pleasure.
T...