First she violated the German language, then this boy.
Naughty little boy...Come with me for a sec.What are you saying, you shitty little brat...Onee-chan, your breasts are so big! I want you to rub my penis as I suck milk out of your breasts! Can I, Cow-san?Ah! Such a lovely lad.
Should be something like "Ach! Was für ein lieber Junge." or "Ach! Was für ein liebenswerter Junge."