
I tried looking up the novel but the top result was novel spoilers where someone translated a scene. They freaking do it in a closet ⁄(⁄ ⁄·⁄_ /·⁄ ⁄)⁄

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I'm copy pasting
(it's not the full chapter)
“This is a closet!”
“So you hate it?”
I was speechless and swallowed my dry saliva.
Should I chose the academy or Ahin (she meant should she went back to the academy or stay with Ahin)? Reason and longing clashed, and my head was twisted.
The back of the back was already blocked by a wall, and Ahin, who entered between her legs, supported her back to prevent pain.
“...Why did you think you were conquered in the middle of the night?”
I opened my eyes and muttered.
“Is it on purpose?”
“If I just dress like this, I would look at you slyly, so I was afraid that I would hit you.”
Carefully crazy beast.
“When will I be sneaky… Oops,”
Ahin, who caught Negligee as a signal, buried his lips in her collarbone.
The rubber band stretched to the limit, and I ran down my body.
Solid arms wrapped around the waist so that the exposed bare body could not even feel cold.
Then, the warm hand that touched the skin passed the flat stomach and climbed upward.
The muscles felt through the clothes pulsated as if they were pulsating.
While thinking that the silver hair buried in my body was overly sensational, I met Ahin's gaze.
“If you can heal yourself, can you recover your physical strength?” (he asked Bibi if she can heal herself so it wouldnt be a problem to recover her own strength, in case she would be exhausted while doing.. you know:blobamused:)
"Perhaps? If it's possible...”
As I responded involuntarily, an uncontrollable, sinister premonition poured into me.
As if making that premonition to be true, Ahin made a refreshing eye smile that was hard to reject.
“Good.”
“No, no. It is impossible to recover physical strength, ah... !”
He didn't look at the situation anymore, and in an instant he lifted me up and burned me.
It was the night where I felt the stamina of a beast that I had never done in my life.

I copied this from the comment above
Chapter 136: doing it in a closet]
(it's not the full chapter)
“This is a closet!”
“So you hate it?”
I was speechless and swallowed my dry saliva.
Should I chose the academy or Ahin (she meant should she went back to the academy or stay with Ahin)? Reason and longing clashed, and my head was twisted.
The back of the back was already blocked by a wall, and Ahin, who entered between her legs, supported her back to prevent pain.
“...Why did you think you were conquered in the middle of the night?”
I opened my eyes and muttered.
“Is it on purpose?”
“If I just dress like this, I would look at you slyly, so I was afraid that I would hit you.”
Carefully crazy beast.
“When will I be sneaky… Oops,”
Ahin, who caught Negligee as a signal, buried his lips in her collarbone.
The rubber band stretched to the limit, and I ran down my body.
Solid arms wrapped around the waist so that the exposed bare body could not even feel cold.
Then, the warm hand that touched the skin passed the flat stomach and climbed upward.
The muscles felt through the clothes pulsated as if they were pulsating.
While thinking that the silver hair buried in my body was overly sensational, I met Ahin's gaze.
“If you can heal yourself, can you recover your physical strength?” (he asked Bibi if she can heal herself so it wouldnt be a problem to recover her own strength, in case she would be exhausted while doing.. you know)
"Perhaps? If it's possible...”
As I responded involuntarily, an uncontrollable, sinister premonition poured into me.
As if making that premonition to be true, Ahin made a refreshing eye smile that was hard to reject.
“Good.”
“No, no. It is impossible to recover physical strength, ah... !”
He didn't look at the situation anymore, and in an instant he lifted me up and burned me.
It was the night where I felt the stamina of a beast that I had never done in my life
Oh no I think he's gonna rip the tree out T-T
Do hope he won't