Your sister has known him for a day and is only lusting after his cock while you two have loved each other for a long time and have a much deeper connection. Stop making excuses and jump his dick.
man this was f*cking crazy and exaggerated. She doesn't have to put much thought into. All the sudden she has this guilt-trip over her little sister when it should be the other way around. Asami was there first and they made a promise. Shouldn't the little sister be the one to feel guilty for interefering?
@UnknownSaint111 Obviously the situation is different given how they separated and how much time has past. Usually the 'you snooze you lose' rule would apply here.