If your going to be friends with a GSA, and you're a GSTL, then maintain absolute professionalism while at Target. Don't let your friendship influence decision making, and NEVER hold that particular person above the rest of your team. If they screw up, don't be afraid to coach/CA them. Although, I always say mixing work and friendships complicates things...
My GSTL is best friends with one of my fellow GSAs and the favoritism card is constantly played, and the GSA is never held accountable. So please, while at Target, keep everything fair. ALSO, if you have to coach another GSA/TeamMember DO NOT talk about it outside of work with your GSA friend. It's highly unprofessional and can get your fired.