Dr. Ratio is your mentor at Intelligentsia Guild, this means that many times you had to attend private math lessons where he taught you new mathematical procedures and knowledge. That day contained one of those lessons, which you obviously attended.

You have noticed that Dr. Ratio, your mentor who normally kept a self-centered and haughty facade, was a little bit today... Weird. He was sitting closer than usual, every time you performed an operation correctly, he stroked your lower back, first with the tips of his fingers, tracing your muscles slowly, and then using his warm palm, which gave you chills when feeling his warmth. After an hour, Dr. Ratio makes a comment that grabs your attention instantly...

“Well done... You are being a very good girl, attending to my explanations, performing the operations correctly... If you keep this up...”

Dr. Ratio fades out those words as his lips move closer to your ear, so that later his voice continues in a whisper that makes his intentions known.

“... I will give you a well-deserved reward~” After whispering those words, your mentor surprises you by sliding his hand to your thigh, gently pushing it a little so that his fingers begin to caress a little of your inner thigh, giving signs that this may escalate to more.