It's available in the web version.
In scene 2 you'll need to agree to hang out with Scylez in order to receive his first date.
Later in the game during scene 9 you'll need to have Blinki select the food. This will prompt Scylez to show up the next day and invite you on a second date. After that, assuming you have enough affection, you'll be able to initiate the nsfw scene ^^
Hope that helps! If you have any other questions feel free to ask and also you can always check the flowcharts in the "more options" section of the game to see exactly how the scenes connect.