Start with the "Black Hole Information Paradox"
Extrapolate on the idea that information cannot be destroyed.
Imagine that all that information concentrated in a black hole some how becomes self aware.
Note: Stretch (or warp) the science as far as needed to make this happen but make it sound logical.
Will this entity be good or evil? I'm leaning toward evil. As in a threat to humanity.
The entity learns to manipulate itself and then its environment.
An astronomer notices something very unusual and becomes obsessed with finding out what it is.
Add a girlfriend, harem, sister, etc. to make it work on SOL. ;)
Let the adventure begin!
PS: If the only thing out of this you can use is the "girlfriend, harem, sister, etc." , forget the rest and write a story anyway.