Shiro had a phase where he got really into parkour. He would be running down the halls doing little jumps off the walls all the time.
He met matt for the first time because he full on ran and jumped off a box straight into him sending them crashing into the ground.
Matt ended up breaking his arm but during their walk to the nurse he made shiro promise to teach him how to parkour and since then they were inseparable
Here's a thought: Lance although cocky about his looks is low key self conscious of himself so Keith gives him little butterfly kisses all over while telling him why he's beautiful and special.