Looking for a manga

I’m looking for this story but I can’t remember the name I have adhd so it’s very hard for me to remember things but I rmb small details I don’t rmb the main character but I rmb it was 3 girls, they were all friends one of them a chubby one who ended dating another girl I think it was the ml sister and the another other friend who got into sm or dressing men in women clothes but that’s all I can rmb oh!