I had my doubts, but I'm sure Micchan will be a thing in this story, not sure if she's gonna end up stealing Sachan from Ayane or Ayane would pass away leaving the way clear for Micchan step in
Micchan is totally in love with Ayame now, I think. At least she has the hots for her (lust, like how she looked at her fingers, and the shampoo, and etc there's a lot of hints)
Micchan is actually in love with Sana. It seems like she hates Ayame for some reason (most likely bc she felt that she took Sana away from her) but is not sure why. Whenever she is holding Sana’s hand or is close to her, she blushes or shows signs she cares deeply for Sana.
Ayame poses her a question at the end of ch 8 and asks if there’s really anyone who doesn’t make her heart race. And after Sana smiles and holds her hand, Micchan blushes and looks at her in a daze.