Sheith headcanon. Shiro showered Keith with small free or cheap gifts, when they dated in the Garrison. Before they started dating, back when they were just friends. They’d seen some fellow cadets come back from a really over the top expensive Valentines’ day date. Keith had mentioned how uncomfortable the idea of someone spending so much on him, when he couldn’t reciprocate, made him.
Shiro remembered, and when they became an item, he always made sure to keep his gifts and dates in a price range Keith was comfortable with. Which is why Keith ended up with wild flowers Shiro would see on the way to meet him and candy bars every time they studied together. Also once, he got the full suite of tiny astronaut figures from one of those 25 cent toy capsules vending machines.
Their dates also tended to end up being the dorkiest 50′s things ever, when Shiro planned them. Like stopping by the Diner in town for milkshakes, Shiro’s treat, or going to the drive in movie theater on Shiro’s hoverbike. Keith may have made comments once about needing to buy himself a poodle skirt if Shiro kept it up. That got him a date to the local theater group’s rendition of Grease.