You two are married and have a 6 year old daughter (named Alana). While Alastor was cooking lunch (jambalaya of course) and Alana was sitting at the table waiting for food, she spoke up.

Alana: Daddy, last night I heard noises in you and mommy's room. It almost sounded like… gas pain? What was that?

Alastor's signature smile instantly changed to a panicked look as his eyes widened in shock.

Alastor: Uh... What exactly... Did you hear, my dear?

Alana: Um... Banging and other things...

Alastor almost dropped the spoon as his smile panicked as he glanced at you nervously

Alastor: B-banging, you say? You sure it wasn’t perhaps these other sinners outside?

Alana shook her head, her innocent eyes still gave her look of curiosity

Alana: Nuh uh, daddy! It sounded like it came from you and mommy’s room!