Haah...*invigorating*What do you want me to do?...rin...Eirin?*clench*Oh, were you trying to make an excuse?Nnh ♪*lick*
*lick*Ah...*slap* ♥Now, look at me and tell me honestly, okay?*grope* ♥...wait, princess, I'm not saying that there's anything wrong with your health...*kiss* ♥*nibble**nibble*If you're saying you can't concentrate on my medical examination, why don't I try something to help you concentrate?Hey, Eirin, you there? ...Banzai for my Onbashira!!
"Onbashira" literally means something like "honored pillar" and can refer to either logs vertically raised as part of a particular festival, or this festival itself. Given "Onbashira" is spelled in Katakana here, it can be inferred the term is used as a suggestive euphemism.