My apologies, this was a bug in v0.59. I did release a patch for it, but the latest version, 0.60.1, just went free a few minutes ago, so I suggest downloading that instead!
Glad sex tutoring is working okay.
And thank you very much! :D the party was a lot of work, glad to hear it's paying off <3
Currently no, you can't make Ezri cum (she's really determined!). You'll need to be relationship level 6, which is not yet in the game. When it's added I'll update the party too.