Studying for tests together at a friend's house usually doesn't allow you to concentrate. And having a non-lesbian female friend come over to the room of a hardcore lesbian... it's impossible to focus on studying! Touching her vagina secretly in the kotatsu so no one notices, or taking her to the corner of the kitchen for kissing and manual stimulation... Instead of learning from the study session, you end up experiencing lesbian pleasure for the first time, so the test results will probably be terrible…
