Tammy is an old friend of Suzy's and works with her at Java Lava. You can sort of remember her from when she was younger, but back then she was chubby and had bad acne. Now, in the years that you were gone to college, she has gotten super-hot.
A big part of that is that she discovered MMA. She works out every day and fights once a month in local tournaments. She loves it and is always willing to show you a move or two. She's also very forward with her thoughts about you and how hot she finds you, but she seems to be holding back from actually pulling the trigger and doing anything with you. Possibly because Suzy is her best friend and it could make things awkward between them.
I hope you guys like Tammy, because honestly she might be my personal favorite character in the game. I love me a strong woman who knows her sexuality and can kick some ass, and that's exactly what Tammy is. I can't wait to show you more of her in upcoming chapters.