Calculating Love : SineTan (2020)

Both of these short BL stories center around moments of studying - with one ML being more studious, and the other being more distracted. They both appear to be friends-to-lovers dynamics, but Skip School takes place after the leads have already started a relationship together.

Both series have main characters who start of as friends (with one liking the other as more) and evolving into uncertainty once the second friend realizes that they too like their friend as something more. This inevitably leads to the back and forth doubt and attempt to win his friend over.