Chidori's constant fear of others finding out really tells you that something sad has happened to her it really isnt on Nanohas mind that much and she only went with it to avoid the friends teasing but yeah you can really tell the difference of someone thats experienced some bad things due to ignorance/fear of something different with just their actions well done author.
Well you gotta believe in your taste and choice of friends and that they'll support you through thick and thin Chidori but i do get your fear especially since you experienced something bad at an especially sensitive age.
Cute chapter.
That sleepover really is long hoped for lol, bath together ? Finally some more serious talks to deepen their understanding of each other and their emotional connection ? Finally a date with just the two of them? Yes please.