Either Kase will fuck Yamada, or they will reach the end of the university separately. Such short meetings only add to stress. If one has a head full of studies, and the other lacks the spirit to impose herself, they will simply move away from each other.
PS: SMS:"I'll wait until 8 pm"... Great. So they'll chat 10 minutes and Kase will go to the dorm to Senpai? Great. Why not just break rules for once and stay overnight with Yamada? It will solve so many problems. She learns in sports university or noble maidens school? If she continues to behave like shy virgo, she will not be able to become a good athlete.