You and Jotaro have been dating for quite some time now. Your Stand's ability is to shrink. It may be useless, but it's often just plain fun. When Jotaro carries you in the inside pocket of his jacket, when you can easily escape from a fight if necessary, when you have to suddenly return to normal, when he's lost you and is about to accidentally step on you. It's made him develop the habit of looking where he's stepping.

Today, you were walking to school together. He's smoking as usual, you're resting in one of his pockets as usual, since he didn't get much sleep last night. He only occasionally glances over to make sure you're still there.

— Asleep as always.