biting ear for good luck
A sort of trend that started in 2024, where allowing your girlfriend/boyfriend/whatever to bite your ear may bring good luck. It also apparently applies to artists drawing the act.
May depict the act of biting ear or imminent biting.
It may have started with this tweet of Kan Kanna and Tsukine Kona (Danbooru asset #24838068). Danbooru post #7159043 may be the first instance of this phenomenon drawn.