Search Results: he only shows up when he has no girlfriend

So I've been working at a place this summer where I grew up and one of the girls I was working with I've known since I was young but I only began talking to her this year. Some details about her, she is downright gorgeous so I'm very nervous around her, she is 2 years younger than I am, her little brother also works with us and I was asking him and he says he isn't sure if she likes me because she doesn't like to show her emotions that much. She usually laughs at my jokes, and I've caught her checking me out a few times but I'm sure she has too. She knows Im very into her, all of our coworkers do, just because the way I act. Occasionally she will rest her head on my thigh if we are sitting next to each other but it's only happened like 3 times. Sadly my job is over but I do have her number, snapchat, etc. We do not usually text, but we do snapchat often, her usual pics are half of her face which I don't know why because she is beautiful. If I catch her eyes she usually does a huge smile and I just melt. But I've never had a girlfriend and I'm clueless when it comes to this stuff. One of my coworkers asked me if I was going to ask her on a date but I have no idea how to ask a girl on a date. I don't know if she is just being nice because she knows I'm into her or if she likes me, so if you guys could help me out that would be awesome!