Nice One, Otaru-kun ... you've spectacularly raised the "Ojou-sama" & "Sexy Onee-san" flag(s) with Hojou-san, and (to put it bluntly) it turns out she's burning up with lust over you; so much that she just might have had a hand in that hypnosis app message sent to you earlier.
Conclusion: You Lucky Bastard ... GRR!
Will say nothing more that might spoil things for those who wish to read it for themselves, except to consider Tamano-sensei's latest work as "APPROVED!" 😘ðŸ˜ðŸ¥°