He wants to teach me a video game - am I reading too much in?

Yes, he's flirting with you...

Its obvious that he's interested from what I'm reading here

lol if he willing to TEACH you to play video games, id say he's interested haha. especially if he lets you play online and on his account. I personally would not let people play on my account. not even my little brother or my good friends because they will mess up my kills and stats. so if he's willing to teach you and spend HIS game time to teach you, id say he's at least somewhat interested. I would say its a dream for a lot of us guys that game to have a girlfriend that also loves videogames as much as we do.

He is only using the video game thing as a way to justify his purpose for coming over. It sounds like he is attracted to you, but whether he really likes you or not is another story. He may just want to see if he has a chance to get into your panties. That's up to you if you want to let him, but don't expect any real feelings from him afterward because it's going to turn into you being a booty call and nothing more. It's up to you how you want it to work out.