Mafiatale Sans x female reader (Possession)

Over thousands of years the Underground's hopes of becoming free had slowly disappeared and have gone to alternative motives: Money, sex and power. A human soul these days has become almost priceless with very notorious gang members and it just so happens their luck has just rolled in. Not only a human has strolled into town, but she's been spotted by a well known mafia leader that goes by the name of Sans... and he just can't let a doll like her go.