Yes, I overslept a little

The next day started. I woke up and saw that my roommates were already awake and getting ready to go to the dining room for breakfast.
"Morning, sleepyhead!", one of them greeted me. "Should we wait for you to get ready?"
"Nah, you don't have to", I replied.
"Ok, see you downstairs then."

After they left, I grabbed my things and went towards the small bathroom on our floor. I heard a noise from inside, so i decided to knock, but there was no answer.
'I must still be sleepy and probably just imagined it', i thought to myself.
I opened the door slowly, it wasn't locked.

Then i saw where the noise came from: the window was left open, so it must have been the wind. It was cold in the bathroom.
'I'm already late, so no time for a shower. Maybe I'll get to it later.'
I washed myself and got clothed quickly. There was a knock on the door.
"Hello? Anyone in there?" It was Nathalie's voice.
"Yes. It's me, John."
"Okay, be sure to make quick, if you want to get some breakfast."
"I will. Wait, shouldn't you be downstairs too?"
"I got up early and already ate something, so I went back up to brush my teeth."
"Oh, in that case you can just come in and do that. I was about to leave anyways."
"If you say so." She opened the door, which I thought I had locked when I entered.
"No wait, I'm not fully-"
Too late. There I stood. In boxers and a shirt. In front of Nathalie. My seminar leader. With a raging morning wood.
We both looked at each other shocked. My eyes fixed on her red face, her eyes fixed on my crotch.
"Ehm, soooo....." I didn't know what to say and neither did Nathalie apparently.
After a few seconds she regained her posture, turned around and shut the door behind her. All whilst shouting "OhmygodIamsorrythatshouldnothavehappenedsorry!"
Never have I seen her this embarrassed. All I heard were some footsteps and a door closing, she must have just went to her room.

I finished getting clothed and took a look at the door, especially the lock. Sure enough, it was busted.
I sighed. 'Great.'