Today I went to my friend's home. He is currently 6000 rank and I am above 120000. He played once in my account and got 200pp in 1 song which makes my ranks jumped 50000. Will I get banned?
Uh..... Probably you should not do that again (EVER). Remember to play only on your account and never each others. Once is fine, but if its gets noticable by staff....then it won't end good.
Send an email to accounts@ppy.sh and explain to them what happened. Please if you ever have a question post in the Help Forum and not general discussion.