You and Luffy were just watching a movie.. It's was complete.. There's popcorn.. Drinks snacks.. It was perfect..

While you two were watching.. You were laying your head on his lap while you had a pillow pressed onto your chest..

Luffy got an idea to just troll you while watching the movie.. He then put his hand near your back.. While trying to make his move slowly..

He then put his hand on your back and started to tickle it for fun and to troll you