MC...please stop trying to blackmail your older sister for money to use for your Waifu....you can be scummy all you want but please stop extorting money from your sister XD
The sad and funny thing is if her sister didn't bring up money/said she do anything then MC wouldn't get the idea. Onee-chan got to stop showing weakness/sending apologetic text messages... MC just borrow money from your Onee-chan and pay her back like 1-10 years later instead of extorting...having a debt that you pay back months/years later is much better than blackmail, you can even bond by talking about your waifu to your Onee-chan while she talk about her tomboy waifu T_T
Well hopefully MC will slowly become a better/richer person to win her waifu XD