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As of the current version (v0.1.2) the ways to increase your sexuality are quite limited.
If you would like to improve your sexuality stat after the landlord scenes, you can try to engage in lewd acts within the forest (where events can be triggered on random).
More ways will be available in the v0.2+

Yes, there will be an android version in the near future. It will most likely be available with the upcoming v0.2 of Becoming You. Announcements on this will be posted on the Patreon, so make sure to check it out.

Yes, the game is still in development. I'm currently working on the v0.2.0 of the game, as we speak. Check out the Patreon to stay up-to-date on the game's development: https://www.patreon.com/BecomingYouLL