I like giving oral best right after he's showered. I don't see why she would need a condom if you were fresh and clean, unless she hates the taste of cum, in which case maybe she stops before you cum?
This may sound weird, but there is a supplement called "horny goat weed" that my husband uses occasionally to help him last longer, he also seems to get harder when he takes this. Obviously there are prescription meds you can take as well.
In regards to the knees, I am rarely on mine when giving oral, he's usually laying on his back and I just position myself over him reversed I guess. Could she just roll on her side and you turn or something? There are lots of options, just be patient. Also, does she ever like oral? She might be more prone to do you if you do her.
Good luck!
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