Usually the 'I-found-out-your-secret-hobby' kind of development leads to blackmail or coercion. But that's not the case here and I'm really glad it didn't.
... Just Aresh being the tsundere doting boyfriend (and is also the superior at work) who takes care of his overworked yet still workaholic lover/subordinate, Sei.
I AM DEATHLY SCARED OF PROMOS.