This series is a contemporary, romantic comedy 8 book series based out of a gym called Training Days. It has May-December, friends to lovers, enemies to lovers, brother's best friend, fake boyfriend and out of my league tropes!
Haven Hills is a contemporary 4 book series about the small town of Haven Hills and its surprisingly gay friendly community. It features three May-December romances and a friends to lovers romance. There is plenty of comedy and plenty of fluff with very little angst.
The first book in the Haven Hills series is connected to the Training Days series only because Byrum is Wellston's dad, and they both make appearances in each other's books. You don't need to read either book or series to know what is going on in the other.