Young secretary [F] at work wants it [M]

Hello everyone, I’ve been a reader for a long time and finally decided to post cause I need your advice bad!

So a little backstory. I started at my new current job a year ago, I work at a bank and since I started I noticed the bank employs very good looking secretaries. Like seriously hot, there’s 4 I constantly see and they all look tight with nice ass and big tits. The one in this story lets call her Carla, she’s 21, 5’5” redhead, skinny with nice tight butt and perky tits. So I’ve always been a little shy and takes me a while to get comfortable with other people but once I gain confidence with someone I become easy to talk to, and I’ve always done well with girls but can’t tell when they’re into me unless its really obvious. For reference I’m 5’7”, 27 brown hair, green eyes, athletic build.