Here are some phanfics that I recommend on Wattpad and Fanfiction.net. Most of these are E/C with some Erik/OC and Erik x reader. There is also a R/C phanfic on this list, too.
-The Phantom Ascending by @olivesky (Wattpad)
-A Phantom Christmas Carolby @CharlesToth (Wattpad)
-The Man Behind the Mask by @Christinedestler1 (Wattpad)
- Phantom of the Opera Text Messages by @TheMJ1955 (Wattpad)
-A True Angel by @TaylorisaPOTOFan (Wattpad)
-Pen A Pal by @LJangel527 (Wattpad)
-E/C One Shots by @nightmare_carousel (Wattpad)
102Please respect copyright.ＰＥＮＡＮＡIVyMgnABIC
102Please respect copyright.ＰＥＮＡＮＡRK0zHTM11X
-The Man Behind the Monster by @lukesagoodboy (Wattpad)
102Please respect copyright.ＰＥＮＡＮＡALboSUMtrp
-The Phantom of my Heart by @butterflygurlll15
(Wattpad)
102Please respect copyright.ＰＥＮＡＮＡJmLnoIs8no
-My Angel by rororogers (Fanfiction.net)
102Please respect copyright.ＰＥＮＡＮＡCRz4oxA6T6
-Her Story by GoldenLyre (Fanfiction.net)
102Please respect copyright.ＰＥＮＡＮＡd8OY0cxWxa
102Please respect copyright.ＰＥＮＡＮＡWosHTw1Dxm
-How Phantom of the Opera Should Have Ended by @Funk As Puck (Wattpad)
102Please respect copyright.ＰＥＮＡＮＡJBgNaBzBSJ
102Please respect copyright.ＰＥＮＡＮＡCOCnJz9D5B
102Please respect copyright.ＰＥＮＡＮＡ3dC5iU55cR
-No Dreams In Her Heart But Dreams of Love by Christine de Nuit (Fanfiction.net)
102Please respect copyright.ＰＥＮＡＮＡZ49YfD2ql8
-POTO One Shots by @PhantomLover2000 (Wattpad)
102Please respect copyright.ＰＥＮＡＮＡcBYD4KvFZF
102Please respect copyright.ＰＥＮＡＮＡMygjCaQP3g
-Unexpected Life by @hannahdestler (Wattpad)
102Please respect copyright.ＰＥＮＡＮＡVyRAlqLbuB
-Dreams Came True by @hannahdestler (Wattpad)
102Please respect copyright.ＰＥＮＡＮＡxxBTRsnYpE
-Happily Ever...Phantom? by @LoveQueenElsa (Wattpad)
-The Phantomous Tales of the Phantastic Phantom by @therealprimmadonna (Wattpad)
-Our Love Is Evergreen by @BrendaDaaeDestler (Wattpad)
102Please respect copyright.ＰＥＮＡＮＡnllCGH9U7y
-Every Waking Moment by @ChristineDaae1881 (Wattpad)
102Please respect copyright.ＰＥＮＡＮＡpWtEYzspVz
-The Phantom of the Phantom of the Opera by @BrendaDaaeDestler & @EmmaMarchAdams (Wattpad)
102Please respect copyright.ＰＥＮＡＮＡrUeLnP2LIP
-Hear My Voice by @TheSwedishSoprano (Wattpad)
102Please respect copyright.ＰＥＮＡＮＡR7Qu3Lelf9
-In Dreams She Came by @BrendaDaaeDestler & @EmmaMarchAdams (Wattpad)
102Please respect copyright.ＰＥＮＡＮＡPFw7Wrn5jS
-Never Learn To Be Lonely by loveyou232 (Wattpad)
102Please respect copyright.ＰＥＮＡＮＡ0QJPP0nQo5
-My Angel of Music by @Christine__Daae(Wattpad)
-The Man Behind the Monster by @Hawkfrostlover13
102Please respect copyright.ＰＥＮＡＮＡI5bawW6F1y
-I Love You, My Angel by @ cornelia-phantom (Wattpad)
102Please respect copyright.ＰＥＮＡＮＡ0rJkVHEfTj
-Phantom Christmas Story by @Destler_Erik (Wattpad)
102Please respect copyright.ＰＥＮＡＮＡZhFDnaLfoF
and then Add to home screen.