
i think helping someone fiancee in bed is over the limit. just imagine someone else help your lover in sexual way. giving handjob/
or something like that. are you really ok with that?
Ren's point is valid, if he stay,he will DEVOUR Kaede and hurt him more than ever

Exactly. Ren realized his mistake too late.
Ren shouldn't have left his bride defenseless like that, but he probably had high trust that none of his family would take advantage of the situation. Now he realizes his mistake and that he left his fiance alone and in a very helpless state and something bad happened.
It's a big betrayal of trust. No one would be happy to hear their cousin came in and sexually molested their drugged and delirious future partner.
this time, alll the updates are depressing