I agree with this, make each one unique to the girl. If you want to involve the other girls make them be brides maids for each others weddings and whoever catches the bouquet is the next one to get married.
Laura: An Amazonian wedding where you have to beat her in unarmed combat after she hunts you through the woods in Canada while naked (make Logan proud).
Bonus points if Logan is the one who proposes the idea hoping Null won't make it at first but ends up cheering for him anyway.
Jean: Psychic reenactment of The Notebook where you live out lives together before getting married... or Doki Doki Literature Club where Jean is Monika and Phoenix is Crazy Monika where you have to escape the mind trap but still love her when you get out.
Bonus points if you escape by overloading Phoenix's brain with multiple orgasms.
Rogue: A southern romcom where you have to get approval from her family, Logan playing the dad role and Mystique the mom. The wedding has to be southern as fuck but at night with some gothic elements, needs at least one hoedown and the brides maids dressed as southern belles.
Bonus points if the anti mutants you fought show up with confederate flags but they are actually there to apologize and help decorate the wedding, must make
AT LEAST one joke about Rogue making Nulls "south rise again". The anti mutants should also give Rouge picrel bikini as a wedding present.
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Kitty: Have to survive a bunch lawsuits and attacks from the Chemla and Yad L'Achim (and their US equivalents) since her jewish parents don't want her marrying a non jew. Have to win over Magneto who will point out that all children born to a jewish mother are considered jewish then officiates the wedding while threatening a battalion of jew lawyers.
Bonus points if Kurt is the priest and marries them.
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Storm: Beat up T'challa to prove your worth and have the wedding in Wakanda.
Bonus points if you do the african tradition where the village (all of Wakanda in this case) has to watch you impregnate her.
Emma: Make hers take place after Jean where she demands the same thing but far more ostentatious and expensive to one up Jean. The setup is being that Phoenix gets kicked out of Jean through the power Nulls cock then mind jacks Emma and the Stepford Cuckoo's.
Bonus points if Emma demands you impregnate all her daughters before she agrees to get pregnant herself. Limit the Cuckoo's to three... for Nulls sake.
Double bonus points if the Cuckoo's dress as cheerleaders and cheer on Null as he impregnates Emma while his cum is still flowing down their wobbling legs.
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EDIT:
Dazzler: She gets depressed so Null takes her out in secret on the Jet to cheer her up and they get really drunk off enchanted wine in Las Vegas. They wake up later in the desert and have to have to retrace their steps to find the jet. Along the way they find out they had a wild night, destroyed a crime syndicate, launched a massive fireworks display, and recorded a gold record which they then broke over the head of a producer who tried to blackmail Daz in to sleeping with him. Null then takes pieces of the gold record and makes it in to a wedding ring and the two them get married by sneaking in to a hollywood studio and getting married on set then having sex in front of the film crew, which later gets made in to a movie.
The story ends with the two of them watching it in theaters and Daz complain about how they censored all the good bits to make it PG-13.
Bonus Points: this was all a setup by Loki for his personal entertainment in style of Sanguine from Skyrim. We also find out Loki is a fan of her music and follows her on social media.