To the end

Keith is an intergalactic star, and Shiro is a VET who owns a run down martial arts gym essentially made out of shoddily taped together training mats

Keith loves the gym because none of the clientele care or know who he is, and its reclusive owner gives him him a run for his money on the mats (he's not too bad to look at either).

He likes to pay for small upgrades in the gym, and waves Shiro's objections away by telling him that it's an investment for himself

And he's sneaky enough that Shiro doesn't notice the gradual slide between paying for training gear for the gym to things just for Shiro; a new phone 'to take his business calls'. Not until they're deep in a burning new relationship and Keith asks Shiro to attend a gala with him

"I want to show you off"

The clothes have no price tags, and the store is grand with high ceilings. The shop assistant is dressed in a fine suit and follows them attentively around the store. Shiro's ears burn like embers when Keith presses a fine silk shirt to his chest, lined with sparkling gold.

A sapphire like a brand at the base of his throat. "Perfect" he breathes, as he slips a black card to their attendant.