My friends new roommate and her surprise

So my friend Rebecca and I were planning on going to this bar for the evening but she called me and said she was running a bit late and that I should wait at her place and that her new roommate Shawna should be there to open the door for me. Rather, than wait in my car I went upstairs to her apartment like she suggested. The door was slightly open so I walked in saying hello; to see if anyone was home. I heard some noise in the kitchen so I walked over to check it out. It was Shawna cooking. She was actually a pretty cute girl. She was wearing a white tee shirt that just about covered her ass and some grey leggings. I put my hand on her shoulder saying hello. I guess she didn’t hear me come in so she was kind of startled and jumped when I touched her. But she knew who I was because we met once before in passing. She smiled and said "hey, you scared me; I didn’t hear you come in". I apologized and told her Rebecca said it was it was okay for me to wait for her here.
So 20 minutes pass and I am sitting on the couch and I decide to get up and get something to drink. I walk to the kitchen and I can see she is still there in front of the stove making pasta. I gently put my hand on her hip and smiled at her as I made my way past her and she kind of smiles at me too. From what Rebecca told me about her she was a pretty cool person and we were into the same stuff. So when she smiled back I definitely became more interested in her. As I am getting some ice from the freezer she dropped the spoon that she was using and a bunch of pasta got on to her shirt. I turn and jokingly tell her to keep it the pot. It was kind of lame but she smiled. So she starts cleaning herself off. She licks her fingers and then she lifts up the bottom of her shirt a little to lick the pasta off and that’s when I saw it, the outlining of her penis in her leggings. I was completely amazed. I mean I really had no idea. Rebecca definitely didn’t mention it. I just kept staring in confusion.