4(TTIRAAS)

Similar to idea 3 where many women are attracted to Rimuru and try to pursue him but this time our dear slime isn't oblivious to it.

At first he let it go, as he thought that ignoring the girls' approach would make them realize he wasn't interested in a relationship(or at least for now, he had more important things to take in mind).

But it didn't work and they just tried to pursue him harder while fighting constantly between each other.

Until one day Rimuru lost his patience and decided to say he had already promised himself to someone which of course led to everyone asking who that person was.

With said person being nonexistent, Rimuru almost pleaded Ciel to save him until Benimaru's red hair remembered him if the perfect person to throw to the wolves(not literally...I think xD).

With that, Rimuru told them that Guy Crimson had him make a deal/promise that if he broke Guy's perfect balance that they would have to get married and with Rimuru's luck he had done it multiple times so he was now permanently engaged to Guy until they got married.

What happens next? It depends on the writer but a few ideas are: the girls confront(translation: try to kill) Guy as he denies ever having Rimuru make that deal/promise or Guy decides to roll with it and when the girls go to him he says he is still planning the perfect wedding for himself and Rimuru but that he will certainly marry Rimuru and not accept Rimuru or himself to have any other spouse.

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Another way this could go:

Rimuru is confronted by one or more then one of the girls who like him(this would be right after the last fight or a few years after it and let's say that only some guys know he is a reincarnation...and if the girls know he is one, they don't know he has all of his memories or something like that) about who he likes or wishes to marry.

But instead of saying what he said above, Rimuru would say something like 'Uhm...you guys know I'm only 3 years old, right? I do not plan to marry that young...and it would be a bit bad seen if...any of you married a 3 years old' because why not use that despite everything he did and knows, that he is technically still a baby/kid in the Tensura world?

Of course that they may try to wait until he is 'older' to continue to pursue him and he would later have to deal with this again but maybe until then, he could have already made a choice