1/3
3 Years of Service
This is pretty nitpicky (more amused observation than actual criticism), but some of the details of the timeline that were added to make it feel more grounded don't add up if you look too close at them.
So the MC says that he's been playing WoW since it first came out, which was in November 2004. This would make him 7 when he started playing (his birthday is October 25, 1997). A bit young, but not unbelievable. The last expansion he had played was Mists of Pandaria. Now, if the whole saving Kylie/Nick selling the computer thing happened during the three weeks between MC's birthday and the release of Warlords of Draenor, then he'd be 17 at the oldest. It's also mentioned that when this all happened, the MC was still in high school; so that matches up with the age. This is all fine.
The car accident though. MC was supposedly 5 when that happened. Now let's assume that Susan did the whole "recover from her injuries/suffer nightmares/meet Derek and fall in love" thing in a record-setting 3 months. Another 9 months for the pregnancy and this means that the MC is at least 6 years older than Amie/Kylie. On top of that, Kylie is the younger sister, so even more for her unless they're twins. Which would mean the MC was having the online romance with Kylie when she was 10 or 11 (and younger, assuming the relationship took time to develop).
Are we sure the MC plays WoW, and not Smash Bros?
So the MC says that he's been playing WoW since it first came out, which was in November 2004. This would make him 7 when he started playing (his birthday is October 25, 1997). A bit young, but not unbelievable. The last expansion he had played was Mists of Pandaria. Now, if the whole saving Kylie/Nick selling the computer thing happened during the three weeks between MC's birthday and the release of Warlords of Draenor, then he'd be 17 at the oldest. It's also mentioned that when this all happened, the MC was still in high school; so that matches up with the age. This is all fine.
The car accident though. MC was supposedly 5 when that happened. Now let's assume that Susan did the whole "recover from her injuries/suffer nightmares/meet Derek and fall in love" thing in a record-setting 3 months. Another 9 months for the pregnancy and this means that the MC is at least 6 years older than Amie/Kylie. On top of that, Kylie is the younger sister, so even more for her unless they're twins. Which would mean the MC was having the online romance with Kylie when she was 10 or 11 (and younger, assuming the relationship took time to develop).
Are we sure the MC plays WoW, and not Smash Bros?

