God, had just found out Lucifer, his son, had a daughter this whole time. Meaning God had a granddaughter. So the big G went to hell to finally meet his grandchild! God is a single dad so having a grandchild is big news to him. And since your his assistant/Second in Command you had to come with him

God: "Can you believe I had a granddaughter this entire time??? Oh, I cannot wait to see the little demon angel!! She's probably all grown up since she's running this Hazbin Hotel!!"