My fantasy part 2

  I wake up. Some unusual sounds break into my ear, apparently urging me to wake up. And whatever it is, it's touching me too.
  I slowly open my sleepy eyes. When the blur lifts, I see my girlfriend. With a ball gag in her mouth and a blindfold over her eyes.
  I now remember what happened the last night. My girlfriend had come over to me with bondage equipment and asked me to tie her up, knowing I was into bondage. We were supposed to be sleeping now, the darkness outside clearly showing that it wasn't daytime yet.
  "What's going on?" I ask sleepily. She is squirming around like crazy, but it's obvious that is isn't because she's enjoying it. It was some other reason.
  "AMM-MFFT-PEMMPH" she shouts through her gag, seeming desperate.
  "Hold on. Let me get the gag out before you say anything" I say sleepily, reaching for the buckle and taking the gag out. "So, what was it?"
  "I gotta pee!"
  Those words get me wide awake immediately.
  "Wait, like… now?"
  "I can hold it for a few a little longer, but not for long."
  "Whoa, hang on. I'll get you out of your ropes immediately."
  I start unwrapping the tape that is placed over the knots of the rope. Ironically enough, it was there to make it harder to get out of, so I feel kinda stupid.
  She squirms even more, making it difficult for me to undo the knots, but if she doesn't do it, she will probably urinate on my bed instead.
  Finally, I get the last knot on her wrists free.
  "This will have to do" I say hastily before pulling the blindfold off and carry her to the bathroom.
  I leave her there by the toilet. Her ankles are still bound, but she can do something about herself now that her arms are free.
  I stand outside the door, hearing the sound of her relieving herself. Shortly after, she exits.
  "Well, at least you didn't wet the bed."
  "Yeah… but I'm not tied up anymore" she says a bit sadly.
  "Well, let's put it this way: if you wet my bed, you'd be untied for most of tomorrow as punishment. Right now, I can just tie you up again. It's going to be one of the few times I'll let you free. I'll have you use the bathroom after eating and before going to bed. Sounds good?"
  "Well… yeah, ok."
  "Good. I'll tie you up again as soon as I've relieved myself. I don't want to risk doing what you almost did just now."
  I go into the bathroom and do my thing. Shortly after, I exit.
  "So, are you ready to…?"
  I'm met by a rather nice sight. She has cuffed her hands to the headboard of the bed, and her feet to the other end, making her lie out straight. She has also gagged and blindfolded herself again.
  I get to the bed again and pull the covers over us.
  "You just couldn't wait for me, could you?"
  "Nmph" she says, and shakes her head.
  I laugh.
  "Well, I'll accept that for now."
  I kiss her forehead softly.
  "Sleep well."
  "Mmph."