When brainstorming, consider these questions:
-Is there anything immediately “different” one of them notices about the other?
-Has one or both of them developed romantic feelings, is this strictly platonic, or is the meet-up more out of obligation for at least one character?
If you want some ideas on the myriad of bizarre, creative, and ridiculous ways that human beings can deceive each other over the internet consider watching the MTV show Catfish. After a couple of episodes, you’ll start to realize just how strange internet relationships can be, and how you can portray these absurd situations in your writing.