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You already got two really good answers, i.e. make it part of a well thought through backstory and make it so the reader really just doesn't care how they got there. I would like to add that if t...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/27039 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
You already got two really good answers, i.e. make it part of a well thought through backstory and make it so the reader really just doesn't care how they got there. I would like to add that if the only thing you are trying to accomplish is for the guy and gall to meet and fall for each other, that can be much simpeler. If the girl is on her way to meet the lady, she could meet the tennant anyway regardless of where the lady is. They could bond over some shared interest, which is also very realistic as that is how it usually goes. The child could just be the backdrop, or an allusion to future events your guy and girl become parents. The scene where the girl takes care of the child and the guy definately falls for her could take place at some later time.