You can solve most of them with an interesting idea.

You contemplate the idea for a bit, and while it is weird it would solve most of her complaints.

Firstly you rewrite a rule

OLD RULE: The orifices and bladder of a petite woman can be filled ten times their initial size without tearing or other serious injury, and will always maintain their elasticity. No matter how far they are stretched out or for how long, their holes will always snap back to their virgin tightness a few seconds after whatever is inside them is removed.

Then you add some new ones.

OLD RULE: Women have a secondary opening in their vagina that can connect to their bladder instead of their womb so that semen and other fluids inserted into them end up in their bladder. Women can choose which opening is available unless their nipples are stimulated at the time of ejaculation, in which case semen enters their womb.

You look around and are relieved to see that nothing has really changed, although things seem a little bit cleaner, a little bit better maintained. You hesitate as you go to write another rule before remembering that you can always undo it later.

NEW RULE: Petite women can be used as a urinal by their lovers at any time.

You then look over the rules that are still in effect from before.

OLD RULE: If an adult woman is shorter than 5 ft 2 in, has breasts that are B-cup or smaller, and has a Body-Mass Index below 24, she is considered a petite woman.
OLD RULE: It is incredibly hard for petite women to gain enough muscle or fat to lose their petite figure, and incredibly easy for them to lose enough of both to maintain it.
OLD RULE: The only clothing petite women are allowed to wear are panties, thongs, and bikini bottoms.
NEW RULE: Protective wear for petite women must be made as revealing and/or sexy as possible without compromising safety.
NEW RULE: The romantic partner of a petite woman has the right to grope and fondle the woman's body no matter where they are at the time.
OLD RULE: Petite women are not allowed to sit in a seat that does not have a dildo either strapped onto or built into the seat. The dildo must be at least five and a half inches in length and two and a half inches in circumference, and the petite woman has to sit in such a way that the dildo is fully inserted into either her vagina or asshole.
OLD RULE: Petite women in a romantic relationship with a man are allowed to substitute the penis of their lover for a dildo, regardless of the size of said lover's penis. Petite women in a romantic relationship with another woman may also sit on their lover's lap, provided that the lover is wearing an appropriately-sized strap-on dildo. In both cases, the lover gets to decide what hole the petite woman has to fill, and male lovers are allowed to cum inside the petite woman as many times as they wish.

Christina snaps her fingers at you. "Are you ok? you've been spacing out a lot lately. Did you freak out when I joked about getting pregnant? You know I would never surprise you like that, although there isn't much I can do if you are fondling me when you cum." She then gets an angry frown "Although I cant believe you are allowed to just piss all over me whenever you want now. I know some people were into that, but I am not."

You finish off the coffee you've been drinking. "You should hop back on me now that i'm done." Christina just sighs and rolls her eyes as she eases herself up and off the dildo before hurrying around the table. She stands there glaring at you as you have to fish your erection out of your pants. once you are free she hops onto you and with a shudder eases her tight opening onto your shaft.

As soon as she bottoms out she starts to gently bounce on your shaft as you run your hands down her back and grip her ass. She giggles a bit. "If I knew I would enjoy this so much I think I would have hopped on you much sooner in our relationship instead of insisting on only my dildo for so long." Your hands move up her sides and without thinking you reach up and tweak her nipples. Christina gasps and clenches down on you as you feel something shift inside her. Her eyes widen in panic "Nicolas, you didn't..."

You flinch as you remember what you wrote before letting out a nervous laugh. "N-no, im not even close. Im sorry, I thought it would be hot." Christina glares at you as she continues to gently bounce on your lap, which somewhat diffuses the effect. "I know you can cum inside me, and touch me as much as you want, but its too early in our relationship for children." You quickly nod in agreement and move your hands to her waist as you slowly get closer to climax. The spike of adrenaline from your close call drives you over the edge quickly, and you empty yourself deep inside her. She shudders with each pulse of cum you shoot into her.

You sigh as your body relaxes and you lean back as you gaze down into Christina's smiling face. You feel an upwelling of love for this woman.

Soon however a frown crosses your features. The coffee has decided it is done being inside you "Christina, I know you were just complaining about having to get off me if I have to pee..."

She gives you a dead stare before rolling her eyes. "I cant stop you, and I guess ide rather have it here then in my mouth." You realize with some horror that you weren't exactly specific with that last rule...

You slowly relax, and you both let out a shudder as you feel your bladder empty into her. She shivers as you finish "Wow, that was warm. You do realize that while you may not have to go anymore, I now do... *sigh* Ill just have to get one of those urethra plugs ive seen advertised." You pull her into a hug for a bit before you realize how late its gotten and that Christina needs to get back to work.

She hops off you, only a small trickle of your fluids escaping her before she grabs her dildo, gives you a kiss, and runs across the street.