I'm confused
Page 1 technically comes 2nd to last chronologically, if that helps. The essence of the story is that Marie (13, darker hair) has a crush on her aunt, Eri (_5 (I’m guessing 25), lighter hair), o she has always been close with (Eri would sneak away from cooking lessons to play with Marie hem they were younger). Eri has recently met a guy who she seems pretty enamored with, and Marie picks up on that fact. Marie gets jealous and kisses Eri, ostensibly to leave the memory of that kiss with Eri (probably because she figures that the unnamed guy is going to “steal” Marie away from her). In reality, Marie likely wanted to have that memory of giving her first kiss to the woman she loves before it’s too late.
Hope that helps clear things up.