so I am assuming they had sex? http://dynasty-scans.com/chapters/adorable_to_me#27
Not quite sure how you get that from that page, but I don't think so.
"After what we-" pretty much implies there's no reason for Senpai-sama-chan to be embarassed about getting naked 'cause... You know
I think "After what we-" meant kissing in a public place and Senpai-sama-chan affirming her feelings. She's shy about getting naked because it's a big step forward.
Could be, but i believe something happened in between since senpai gets extra blushy when she says that and gets desperate, likely to stop her from telling the readers any more information, it's a little too strong of a reaction
I dunno, there's no indication that significant time has passed, and Chika continuing her previous line of thought suggests it hasn't been very long at all. Certainly not enough for a very significant act like that. As to the blush, I can see senpai reacting strongly even if she hasn't had sex given she's pretty shy to start with.
Plus, it's not a very sexually-oriented story to start with and is otherwise concerned with just being in a relationship. It seems a bit out of place to imply some off-screen sexin'.