I never said anything about Target being able to do anything about it. For the record, they can, it's in your HR field manual.
It isn't the act that would get you in trouble anyway, its the situation that this act could create. If one person called the hotline and said you went out with so and so, but you didn't invite them and now you're giving so and so preferential treatment, you would immediately be told you can't do that anymore. If you outright refused, you would be forcibly transferred or axed for insubordination. Target isn't going to risk getting sued, they don't care who your friend is or isn't, that's not what they pay you for.
Besides all that, it's a poor leadership choice to begin with. It's difficult to garner respect from a team when not all of them feel they have an equal status with you.