you need to choose every intimate option with Mal0, tell Sung about Mal0, dont restrict Mal0, accept Sung's offer to relive you, then after caging Malo release them from the cage, block forgot her names access to the cage, then there are two choices: hold back or go talk; if you choose to hold back, then 69 in bed will open; choose to go talk to the professor, you will agree with the offer and then you will open the scene in the office