When our friend groups met

Sirius and Regulus had bonded over the Summer of 1975 and they decided to stay in touch at school. One day at the beginning of the school year Sirius gets this idea. His idea is to introduce his friends to Regulus's friends. One of his brothers friends is called James Potter. What does Regulus do when his brothers best friend starts flirting with him? Will they fall in love?

Also some of the made up characters from my other fanfiction called Unexpected Fate will be in it.

I hope you enjoy this fanfiction.