First VN I read back in... 2007 or 2008 was Wind -a breath of heart-, which wasn't enough to hook me into the whole VN thingy sadly since I was hooked on anime at the time. It didn't help that my friends only thought of VNs as more or less porn so I couldn't seriously discuss anything VN related with them. Odd thing is I continued to read various VNs in very short bursts around once a year after that for quite a while. And by short bursts I really mean short, something like reading 2 VNs back to back in a few days then repeat after a year or more.
Fast forward to last year and I think I'm slowly getting hooked, thanks to stuff like KnS 2, I/O and Majikoi complete patch. Now instead of months/years between VNs it's more like weeks.