Blackjack with her love - Wild Pegasus.
I was lazy with the cutie mark and simply borrowed this one: [link]
Don't sue me! D:
Also looking at the quality of the pony and then the bottle I believe it's a pretty easy guess what I put effort in. :3
Blackjack is the main character in the Fallout Equestria side fic Project Horizons.
I'm still only at Chapter 20 so far but it's going forward. Hopefully I'll get up in speed soon and catch up. It's really good. Not as good as the original so far though.