I'm sorry but I think that Jo seems kind of curious here because of the behavior of Jo who seems shy at first and chaste ! The eyes are very important here (there is a lot of close up on it to show the interest and the discovery of the other). Jo is realizing his dream so he looks more aroused than Ian but I don't think than Ian is not enjoying ! The last one with Tj was rough and without hints of any romance but here, the last panel with their two hands brings something more intimate