Spoilerrrr!!!
It happens after their first kiss! It should be during a celebration (forgot if it's the feast because mc became knight or it's just a knight celebration) either way mc somehow met the ml, danced with him secretly and the atmosphere just made him realized he liked him and he ended up kissing him. Panicked he runs away to the stable to meet his horse coz he was so embrassed of what happened and of him realizing his feelings. That's when the duke followed him, I guess it was through the mirror, how he knows the MC's location. And they made out in there before returning to the castle to do it completely. Alsoo additional info!! The ml is a complete virgin, so it will be challenging for them as one doesn't have any sexual experience while the other is receiving it for the first time.(≧▽≦)
the art in this is so rofan coded, I'm loving it!!! love me a good slow burn but can someone spoil me when do they fuck like rabbits bc I'm getting blue balls here w all this chemistry but no initiative on either end!!