Glad you're liking it! There are 11 chapters in the game right now (or 10.5 if you count that I'm working on a second part of Chapter 11).
I will say Alex is written primarily as a bottom BUT... A lot of folks are asking for him to top (at least once in a while), so I am working on scenes (plural) where he is going to top. One of which is planned for Chapter 12.