My BESTFRIEND: is my SEXMATE

this is a story of a girl name Cassandra who has never have a boyfriend since birth but she have this super hot boy named Seig who came to be as her BESTFriEND and now his SEXFRIEND and what is there future. STAY as BESTFRIEND in SEX or CHANGE into BESTFrIEND slash SEX slash BOYFRIEND what do you think? SPG alert p...