Bar meetings.

Tim is dragged to a bar with his brothers on a Friday night, both of them have dates so he is rendered a 5th wheel. He bumps into a girl, who was... very very drunk.

Marinette had hit rock bottom. Adrien had died in the final battle, she had no friends and had to leave Paris for hero and civilian reasons. She didn't have much she cared for left.

Tim helps her home, not wanting her to get hurt.

Their relationship grows. Things get particularly interesting when he finds out that she is Wayne enterprise's new head designer.