From 2D Market:
Words can come back to bite you in the ass.
Sena and Yozora learned that the hard way when members of Sena’s fan club interpreted their incessant bickering as a cue to corner Yozora and have their way with her as a warning.
Sena stumbles accidently into the act but, rather than to stop it, she continues to watch silently, captivated by Yozora’s disgraced appearance.
Unbeknownst to her, however, is the fact that the entire situation has been arranged by one, particularly obsessed, member of her fan club. And now he has both girls right where he wants them...