Took awhile to figure out the corruption steps, the basics of stacking lust is easy but the changelog timing/location info is inadequate. Very easy to miss this content, and it's actually well written h dialogue. Corruption is an interesting angle to explore when the main draw of the game thusfar has been a loooot of mind control and variants thereof.
Anyways, to save others the headache,
Hana and Rin - Corruption 1 & 2 - Walkthrough
Hana:
Corruption 1
- During the week, visit her at school and have sex once to at least generate 1 point of lust/corruption. Drain from her chest, brings it to 2 points.
- Fast forward to Saturday Morning, visit Hana's home and choose 'Enter the House'. This will trigger a cut-scene where she's watching a movie, gets horny. The scene culminates early with 'Help Her' or sex with 'Play with Her'. Either decision resets the lust/corruption points to 0.
Corruption 2
- Assuming you just finished Corruption 1, the timing should be Saturday Noon outside Hana's home.
- Choose 'Call Hana', pick any option that will enable sex with her, then go through sex with her 5 times to be safe. That will guarantee the 5 points of lust/corruption to guarantee Corruption 2.
- Make sure to Drain from chest to avoid losing the built up points! There should be a total of 6 points after that.
- This should now leave you with 6 points with Hana, outside her home, Saturday Afternoon. If it's night, skip to Sunday Morning.
- Choose 'Call Hana' again, this will trigger Corruption 2 cut-scene. Like the first one, 'Help Her' culminates early, 'Play with Her' for the full scene. That's the end of her Corruption as of 4.8
Rin:
Corruption 1
- During the week, visit her at the park and have sex once to at least generate 1 point of lust/corruption. Drain from her chest, brings it to 2 points.
- Fast forward to Saturday Morning, visit the Beach and choose 'Rin and Eri'. While nothing happened with this choice in earlier versions, choose 'Say Hi'. This, as cryptic as it is, is the start of Corruption 1.
- After the conversation moves along, Rin is feeling horny this time around. The next choice options are 'Follow Her' for the full cut-scene, or 'Don't Follow Her' for nothing.
- If you chose 'Follow Her', the story moves along and you get a choice same as Hana's: 'Help Her' no sex and 'Play with Her' sex, both options clear her lust/corruption points to 0.
Corruption 2
- Assuming you just finished Corruption 1, the timing should be Saturday Noon outside Rin's home.
- Choose 'Call Rin', and she should be available only during that specific time on weekends at her house. Pick any option that will enable sex with her, then go through sex with her 5 times to be safe. That will guarantee the 5 points of lust/corruption to guarantee Corruption 2.
- Make sure to Drain from chest to avoid losing the built up points! There should be a total of 6 points after that.
- This should now leave you with 6 points with Rin, outside her home, Saturday Afternoon. Time skip to Sunday Morning.
- Visit the Beach again, 'Rin and Eri', then 'Say Hi'. This time around, this is all that's needed to start Corruption 2, the entire cut-scene is on the beach.
- Like Corruption 1, 'Help Her' culminates early, 'Play with Her' for the full scene. That's the end of her Corruption as of 5.1