Dear $young_male_colleague

When $young_female_coworker is having a conversation with you at your desk, please be more careful where you rest your distracted gaze while listening to her.

Professionally speaking, her crotch is probably not the most appropriate location.

Yes, yes, I know, we've seen the pair of you together and it's all very sweet, but not during work, hey?

Best regards

Me

(Edited to address pir's first comment)