The phone texting mechanic is well done and it is an enjoyable exchange. The animation at the fun scene is also quite nice.
Phone texting only has a few things that could use improvement. There was once at the start only one option to choose. It feels strange as if there is no choice there was no need for having it be picked. The other is that the dialogue is railroading the player into specific options. Player choice is nice, albeit seeing how many options are always available it means the player can after the appearance of her almost use all options. It makes the choice in dialogue feel less significant if one can simply choose one option after another. The railroading dialogue has also the problem that it can make the conversation seem clunky in parts. Her offering a date and then the player having to choose some unrelated option being the best example of that.
As I only played the demo I cannot speak for the advanced smut scenes. But what I could choose was well done. Also kudos for having a playable demo for people to try it out.
So, overall a fun project, but the dialogue in the texting session could be expanded more. Maybe having some other ways it can go would be interesting too, like one option having the player be more dominant and another having Mal0 being dominant for example.