Zaitro
Lacking of absolute control over yourself makes you have regrets in the future. Only a fool learns from his own mistakes. The wise man learns from the mistakes of others. Care logic, then Plot.
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Since the MC will probably not get the Nika Fruit, he can just go for one of the fruits of the Gorosei, Kaido, or the Vampire Devil Fruit for the "slot" of the Zoan Fruit. Although he could get more than one Zoan. He may get the Goro Goro No Mi from Enel as the the Logia. Even the Pika Pika is an option He could aim for Pato's (If even exist) as a paramecia Fruit. Although Big Mom Fruit is also really interesting to look for.
My only recommendation/advice would be to add more details to the novel instead of just skipping over some "plot." It doesn't matter if more chapters are added (although it does matter to you since you are the one writing them) to the novel. They will add deepness to the it.
I mean, he just became a woman (temporarily), and he started a kiss war in that shape. If Yuri means just having intercourse and intimacy between two women. Then, this development could be classified as Yuri. Do I like it? I just say that I prefer reading heterosexual intercourse than Yuri. But, it is not really a surprising development. After all, the MC is a shape shifter.
So, even in "present" Lucian develops and grows, he still will be part of "future" Lucian. I mean, what could happen if "present" Lucian reach Sequence 0 and becomes Paradox? Will the "future" Paradox get affected as a consequence? Will the future disappear? What about if one of them reach the level of "Above The Sequence"? Also, has Future Lucian already developed his Harem? Or that's something related with "present" Lucian?
This normally happens with Mushoku Tensei Fanfiction. They try to keep the "essence" of the novel of characters with flaws. However, it was logical and with a proper foundation the reaction of the MC? I don't understand why another Rudeus is required in the story.
Was the Teleportation Incident powerful enough to influence the System? Does that mean the System is equally powerful to a time space curving event at the scale of fittoa? After all, the event was just a consequence of PlayBack Miko summoning Nanahoshi in fittoa. So, does that mean such powerful scale will be totally consistent with such measure in the future? Or was this made in purpose to force that part of the plot?