The demo is a quick and flirty interaction with Maddie at the coffee shop. If you've played Lewd Mod, you know exactly what to expect content-wise, although this game is exclusively focused on chatting, it seems. It's fun to have an extended interaction with a character from the main game, so I would suggest playing that first. 

Like with Lewd Mod, all content here is centered on voyeurism. Maddie wants to show off her body, and you want to see it. Very simple and to the point. The demo was so short that it left me wanting more, so I'll be picking up the full game. It costs less than the cup of coffee Maddie was drinking, so what do you have to lose from getting it and spending some time with her and seeing what she's got to offer?