IDK. Maybe it could've been different in a less candid setting, but based on the editing, BF knew what they were doing. David's reaction was "normal" per se, but I also think he should've been more aware of the children's presence and just chuckled to himself or whatever, then try to move things along. They may have internet access or know of Dan, but that wasn't appropriate. As for the blocking, David could have done so for a number of reasons. Unless someone mentioned me or tried to interact, I'd just let things be, but could also see blocking someone to avoid seeing/spreading X-rated content.