What a twist. BF didn't buy her her excuses those times she was missing or late, he did track his GF and found out about her affair with the old man teacher. Recorded them and reported him which lead to the teacher being arrested and imprisoned. She didn't know what happened just that she was free of the teacher yet felt still sexually frustrated, time passed and one day her BF took her to a hotel and started touching her the same way the teacher did during their foreplay, BF spilled that he knew she and the teacher were having sex behind his back, he sent him to jail for that. BF announced he will rewrite everything the teacher took from him and unlike before he's not letting her take the pill. She apologizes for staying silent the whole time and he isn't done yet, it's just started she regrets not being honest with him because if she did their love would be a pure vanilla relationship however she can't stop it now, a dark feeling she can't get away from her heart that drowns her guilt (her lust is above her guilt so she accepts the consequences of corrupting her own BF).