Your poor werewolf girlfriend is terrified of accidentally knotting your throat during oral sex.
She wouldn't let you reciprocate for the longest time, insisted she was happy with rutting against your palms. She only agreed to try it on the condition that you would handcuff her to the headboard. To make sure she couldn't lose control. You reassured her, silly woof, you'll keep her safe.
You kiss her delicately, tongue guiding her nervously free of her sheathe. She's gorgeous - crimson red and throbbing, slick with pre. You lick the length of it, and she bucks, paws scrambling fruitlessly against silk sheets.
You take her in your mouth, deeper and deeper. Her knot pulses, swelling under your lips- she starts to panick, begging you to back off, that she's afraid, she doesn't need to cum.
Her cries grow to a fever pitch, and you (reluctantly) withdraw to focus on suckling the upper half of her length as she cums. Her knot ties in open air, throbbing desperately. She thrusts her hips up, faster and stronger than you can react, pressing it against the seal of your lips- but it really is too large to pass. In a moment, she collapses, knot still twitching.
"Fuck, God, I'm sorry, that was amazing, I-"
She cuts off with a yelp as you flick your tongue across the sensitive knot. Her eyes widen with fear, and she pulls desperately at the restraints. Pointlessly. From the side, you can fit almost half of it into your mouth and suck at the skin.
She howls.
