YOU SAID:
i really wanna kiss my best friend's girlfriend
INTO JAPANESE
私は本当に私の親友のガールフレンドにキスしたい
BACK INTO ENGLISH
I really want to kiss my best friend girlfriend
INTO JAPANESE
私は本当に私の親友のガールフレンドにキスをしたいです
BACK INTO ENGLISH
I really want to kiss my best friend girlfriend
You've done this before, haven't you.