Yuumi Ability (LoL): Feline Friendship

When Yuumi's attacks and spells strike champions, she heals her for 25−110 (+15% of ability power) health. If Yuumi attaches to an ally within 4 seconds, they are healed as well.

While attached, Yuumi gains Friendship with her ally whenever they kill a champion or minion. The ally with the most Friendship becomes her Best Friend and grants Yuumi bonus effects to her abilities while she is attached to them.