You need to open the menu,
Open Menu = tap with two fingers
Cancel / Close Menu = tap with two fingers
I did make a sequel here (it's also short, sorry!): https://noasfw.itch.io/marins-expansion-delivery-chapter-2, but I am planning to make a longer game as well.
Thank you for playing! Unfortunately, the...kink aspect is pretty integrated into the game, sorry!
As for the choices mattering, I understand...perhaps your choices don't have much weight in influencing the story, but the choices are more for the player to explore different sexual dynamics.
However, in the full version, there will be two separate endings based on the choices selected!