For the secret dating Raven’s POV, she starts noticing small domestic things in both of their homes that are giveaways of each other. Clarke takes her coffee with milk, and Lexa is lactose intolerant and now there is always milk in her fridge. Clarke, who lives alone, has two phone chargers now, one on either side of the bed. Clarke wears contacts and Lexa doesn’t, and there is contact solution on Lexa’s bathroom counter next to Lexa’s hairbrush that’s full of blonde hair. Clarke doesn’t give a shit about sports and Lexa is a big fan, Raven comes over to watch tv and have a girls night and all of the recently watched on Clarke’s streaming apps are sports and she has espn on her Home Screen now. All the little stuff related to daily habits that they forget to hide when they get too comfortable! Trademark snacks they love well stocked at each other’s place, stuff left behind from work, the most boring stuff that they themselves overlook but it’s so glaring to someone who knows it’s not supposed to be there.