How do you tell someone that you will probably end up marrying them, but in a casual way?

How do you tell someone that you will probably end up marrying them, but in a casual way?

Commentary:
🤔💍 "So, like, at some point in the future, we might just accidentally start planning a wedding together… NBD, right? 😄👰🤵 #CasualProposal"

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