I took Takumi's speaking style very casually overall. I interpreted the みてー in the second-to-last panel as a slangier みたい since the panel is making a comparison between her and Mika, for one thing. Also I wasn't sure how to handle the captiony bit in the area above the wand she's holding. Thanks in advance for corrections!
e: I made an attempt at the captiony bit, but one thing that threw me off was the seemingly contradictory definitions for 適当.
Updated
Kya~~~
It's full'a little girls~~~!Yaay!Takumi was called on to do some caretaking.Am I some kinda house maid?I ain't got thoughts like that girl!!It's a misunderstanding!!Tha...That girlIs she actually a grade schooler!?Dada-n! Boing! Boing!That ain't it at all~
Hey, let's play around!Ugh, the heck is this.Mm?Big sis Takumi, are Kaoru and everyone being a bother......?Big sis Takumi's feelings right now are all...It's Twinkly Takumin!
(not serious)Gya-Gya-