Yes. But I think only of Rachel really really wanted it, and they discussed it in full before hand to make sure they were both ok with it and that they had a safe word and everything. I think quinn would find it hot, for sure, but would be incredibly worried about hurting or demeaning Rachel. But if Rachel asked and really wanted it, or if Quinn made the suggestion and Rachel promised her that she was ok with it, then yes. I like to think Q & R are so comfortable around each other that they experiment with a lot of stuff like that.
I can very much see Rachel tying Quinn up as well. And Quinn thinking she’d be terrified at the loss of control (because let’s face it, Quinn’s entire life is about control, and she melts/breaks down when she doesn’t have it), but she actually gets like, incredibly turned on by the complete surrendering of all control to Rachel, who she obviously trusts like crazy.
I like picturing quinn tied up and Rachel going down on her until she can’t even speak her own name, and then afterward Rachel gently untying her, rubbing and kissing her sore and aching wrists and then cradling Quinn, telling her she was perfect and wonderful and so sexy.