Help finding story virgin gf cheats on bf with new coed

[Ireallyneedtostooreading]

Can’t remember the name obviously read this years back, this is the general idea of the story per my memory;

BF and GF in school together they are both long time partners and are both virgins, a new student comes to the school, this new student seduces the gf (helped by the gfs best friend encouraging it) eventually the BF GF and GF’s best friend hangout with the new student the gf gets fucked by the new student in another room while the bf listens and ends up fucking his GF’s best friend.