I would have enjoyed this way more had the FMC not been 21 and the MMC 31 and had known each other since like 6 and 16. I get they didn’t have feelings for each other until they were both adults but it still did not rub me the right way. 

Tropes: Brothers best friend, age gap, family friends, opposites attract

Age gap: 0/5
Writing: 4/5
Brothers best friend: 4/5