Simply attending EE's event.
Right before that, he was streaming 4 days back to back while EE wasn't in town, but on the last day he streamed early because EE was coming home late that day.
And around a week before that, Simply also streamed 4 days back to back while EE was out of town making money and Bonnie accidentally leaked that Simply was using EE's IRL Toolkit.

And for today's streams:
3:02pm Simply posts in his offline chat
3:20pm EE starts her stream in her apartment
3:40pm Simply starts his stream

They are not even trying to hide their relationship, but PJV is. While EE is sleeping in their bed next to Simply.