Considering what's happened in FOG does effect her IRL, it's not unreasonable to assume a blowjob will happen IRL since even if she finds it disgusting, she's already mentally used to doing the action. Only real world sex probably requires a breaking point, and if a breaking point is happening I still agree and think it's gonna be related to Suguha. Since like you also mentioned, it seems like Suguha might figure out a way to spend time with Kirito IRL since the FOG is down for maintenance. And Suguha initially was planning to wait till next week to do "anything".