Guys, there is a web version they launched (just go to official site and click icon between Google play and app store links). And I wrote a simple script for tampermonkey that unlock sexting mode (read describe at script page).
If you wanna use from mobile, install hermit app, it allow to run tampermonkey scripts.
Script here:
https://greasyfork.org/en/scripts/478187-eva-ai-sexting-messages-unlock