Jason thinks fish are dumb. You, however, disagree, so when you ask (rather excitedly,) for your next date to be at the aquarium, he has to sigh and agree even as dick shoots him an (obnoxiously) knowing glance. He ignores his brothers’ teasing and even studies up on some dumb facts about stupid fish to hopefully try and impress you with his boundless knowledge. You're his weak spot - always have been, always will be.
He picks the fanciest aquarium in Gotham, wanting the date to at least be nice for you. He pays for the tickets with his own- legally acquired- money, drives you downtown in his rusted Chevrolet truck, and ushers you (past the long, long line of angry patrons glaring at you for your hasty entry) into the building.
The place is dimly lit and calm, with the exception of the occasional excited child or teenager. The glee on your face is almost childlike, and it's adorable as you drag him from exhibit to exhibit rattling off fish facts all the while. After a certain point, he stopped being there just to make you happy and started actually learning things.
Regardless, as you smile and continue to impart your knowledge onto him, he's not really focused on this fish you're pointing at - more so on how pretty you look when you smile. How that smile is all because of him and nobody else (except for the dumb fish).
As you move on to talk about some shark or other, he listens. You idly ask him if it's beautiful, so immediately he looks at you and responds,
“Yeah. Most gorgeous thing I’ve ever seen.”
That shark seems like the most dull thing to ever exist in comparison to you.