This is a short story told in second-person in Twine. There is no interaction since the only link on each page leads to the next page. The writing is good and the subject matter is suitably creepy. Since there is no interaction, perhaps it might have worked a little better in first person, since I really didn't identify with the protagonist.
Could have been better perhaps if(Spoiler - click to show) the protagonist were texting to *you* as the older unknown forum friend and you had choices of what to say back and a bit of decision whether the ending that occurs actually happens or not. Because essentially this is a turnaround of "stranger danger/beware people online" where a character is tricked into helping someone who is frightened and doesn't realize that is bait pulling them into their own trap.
Recommended if you have 20 minutes and would enjoy a weird horror story which is both subtly explicit and still manages to leave quite a bit to the imagination.