Disregard half-Japanese 'Senpai' ... Sana actually knows what is best in life; getting Touched By The Hand Of Osananajimi, and all that (*cough-cough*) naturally follows from it ... including a well-received confession.
Ah yes, instant arousal for instant Vanilla, sounds great.
Also..."Practice". Yeah, practice is always good, especially when the practice becomes the real thing with the same partner.
"I should come out and confess already"? Yes, yes you should.
But hey, better late than never.