After Clint writes his notes but before he comes back from the bar, he grabs some bread, eggs, and maple syrup, because when a man promises French toast he's sure as hell gotta deliver.
There's no noise from the bedroom, and the clock says it's still the same time he left, so Clint grabs a sheet of note paper and writes a third note. Knowing Natasha has something on her is going to calm his nerves a bit.
This letter takes a lot longer to make than the other ones, because Clint has no idea what jobs Natasha is going to take in the near future or who he should pretend to be for the letter. He edits, and re-edits, several times in his head before settling on what he finally writes down:
Clint narrows his eyes at it, scanning it back over. Yeah, he's pretty sure that's soppy enough. Romance has never been his strong suit. He folds it and unfolds it a couple dozen times to give it a worn look, while listening to the early morning news, then sticks a salt shaker on it to weigh it down.
He starts work on breakfast, once he hears the shower start up. The only thing worse than no french toast is cold french toast.