I don't want to say things like this to my big sister, but... ["ねえちゃんに こういう事 言いたくないんだけど" ?]

What is it?

Your foot stinks.

It's just... I have my reasons. /There is a reason for that.

You have? Huh?

My sister's boyfriend loves the smell of feet he's a bit troublesome, so she does it on purpose.

Now. Will you give me a break? I mean... for real. For me.