Comment by Bcrowenth on Boku no Kokoro no Yabai yatsu - Chapter 155

@Bcrowenth You know, i know, we all know what might happen...

@Raios at this point, we already know it's NOTHING

@Corgi Bottoms  
Hey, not to spoil so if you didn't read Kaguya-Sama: Love is War.
So (SPOILER WARNING BELOW FOR LOVE IS WAR)
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They had se-ex, after that I belive everything is possible in any manga like this.