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So there is a kinda lore conflict going on between Lani and Marla regarding the cat race. In the "harem" route Marla feels more NTR in the afternoon nap scenes, Lani on multiple occasions states she is bonded to MC and should have a physical repulsion to Marla as she plays with her tail. Marla however is actively pushing the MC away from Lani and only really relenting cause of the Bond to Lani even though she could cause Lani to die with the things she is doing to her.

The way Mika explains it Lani should basically be experiencing nausea when Marla touches her sensitive areas or pulling away from her touch. Romantic Physical Affection between two females is different than between a male and female, things like heavy petting and foreplay is closer to Sex for a lesbian couple, where hetero sex represents one of the 3 penitrations (OAV).

Marla causing Lani to experience sexual release should have caused a negative effect on Lani if the MC had taken her virginity or she performed oral. Marla would basically need the MC to tell Lani he was ok with the act of them fooling around as his turn on to even have a chance at protecting her psyche from her feeling like she betrayed the MC because of the Magic involved. 

Thursday there is a ladder on the left of the school entrance that appears once you have received an F, the first time you will see mabel stuck on the fence at 1900. Next week you must adjust the ladder to "punish until the scene ends on its own" (for the previous week), after this you will sneak into Emi's office (avoid the floorboard) to catch her the weeks following at 1900 (do not adjust ladder after the first time if you want to progress).