Eros's Links
They trade information whenever Isaak visits Eros' bar. Eros has also gotten rid of a few of Isaak's former gang friends(?) (he's not good in a fight or anything he's just really good at making potions).
Isaak's friends question his trust in Eros, but in all honesty he trusted far shiftier creatures.
Visiting Eros' bar and just enjoy the evening is a rare occasion and getting some information while at it, is just perfect for Isa. He's oblivious to Eros getting rid of some former work friends of his, maybe he just doesn't want to accept the fact that they want him dead.