 If you liked
Futari no Renai Shoka
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 ...then you might like
Kimi no Okaasan wo Boku ni Kudasai!
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wholesome "drama-free" age gap relationship with a marriage proposal happens in the first chapter, on Futari it's the female lead who does it (the older one) on Kimi it's the male lead who does it (the younger one).
both of the stories focus on nurturing their relationship, Futari is about two people having similar trauma and licking each other's wounds while Kimi is about giving mental support to each other and Kimi also has kid (fmc son and mc niece) where 4 of them making emotional bond.
Kimi vibe is 'bright'
Futari vibe is 'dreamy'