This story is so similar to a novel called "You've Reached Sam" by Dusting Thao. The boyfriend also dies in an accident and the girl is able to connect to him though her cellphone. At the end, she is finally able to accept his death and move on with her life. It also made me cry. This story is so similar that I'm feeling emotional while typing this message too :(
It feels like another of version of Cain (The top) and Yahwi (the bottom)
What's the title?
It's from the same author. Name is Yours to Claim.
Oh btw Cain and Yahwi are the two tops. It's a love triangle
Thanks