Things started to feel different a couple weeks ago. We hadn't seen each other as much as we had previously, and she seemed to start getting clingy (in a good way) with the miss yous, thinking about you, and phone calls/FaceTime.
We had a day on Tuesday where we were able to be alone for hours, and both of us jumped on the opportunity to get physical again. It was different this time. She was very very passionate and kept asking me what I wanted to do. She kept calling me cute, caressed my body, and wiped the saliva off of my face a couple times after we would take a breather from kissing. Heck, she even changed her shorts with me in the room (I went under a blanket to be polite).
All this to me reads that she's had feelings this whole time and was trying to hide it, or that she's developing them. She asked me about my feelings for her a couple times before, but I wasn't ready to share them with her at the time. To me, this feels like the right time to tell her how I really feel.