HELP I've been searching for hours!

[Emily]

Maybe someone here can help me lol
I read a series many years ago 😳 like more then 5 probably closer to 10 years ago and I can't remember the series name.
What i can remember about the books.

Enemies to lovers romcom prank war between a coffee shop owners and the biker garage next door. And there was a sweet old lady always meddling in their business( I feel like her name may be something like millie). I belive there are 3 books in the series. Also the series had a cartoon looking cover. Please if anyone know the books I'm talking about let me know!

[Lisa]

I think it's Ex Games" series by Jennifer Echols or it might be the "Neighbor from Hell" series by R.L. Mathewson, especially the book Checkmate. I could be wrong lol