The best time with [m]y [f]wb

Years ago I had an fwb with an old friend of mine, let’s call her Sarah. We knew each other since kindergarten. One night we were out late and she invited me to her apartment. Then it happened. And it happened again. After that we had a long break but we still talked.
One time I came back from the store and I heard a familiar voice saying hi to me. I turned around and it was Sarah. We had a chit chat then I told her I just bought some new tea, they are really great. If she has the time she can try it.
She paused for a second and said she doesn’t know, but she was smiling. I suddenly realized how this sounded, so I ensured her that we’d only try the tea.
She came up, I made the tea. We talked, I showed her around the house. The only time I touched her was when I pointed out that she has a hole on her blouse, and I touched the hole.
When she was finished she said she is leaving. When she was the door she hesitated for a second then she left.
After that my mind started to wonder if she wanted to do it. Since I promised her it will only be tea, I didn’t want to initiate anything, but then I thought maybe that was what she wanted.
I write her a message asking if I made a move would she let it happen. She replied definitely.
My own stupidity shocked me, but then I asked her if I can visit her. She said her door is open. I became erect.