Well there's the bath, also this chapter really gives me the impression that Wakaba is even deeper in the hole than Komaki. Especially as Komaki seems genuinely surprised by the kiss on the bed.
I'm also getting the impression that Komaki is a coward, and that she's doing all of this because she's afraid of asking Wakaba out, but doesn't want anyone else to have Wakaba's 1st time experiences. It's almost dating with extra steps...