If you like 'friends with benefits' stories, perhaps you would like to have a look at this novella.

It is a collection of short stories regarding exactly that matter. Each 'sex between friends' situation in those stories ends in a different way.

https://www.amazon.com/gp/product/B08ZNBD3V4/ref=dbs_a_def_rwt_hsch_vapi_tkin_p1_i3