Oswald 2.0

金玉「きんたま」の方がいいよ。＾＾

ナット means nut, but as in nuts and bolts.

Haha, show's how bad I am xD

Also with a statement like this 私 and います are a bit formal. Something like 俺の金玉を愛している。 would be good.

not sure if you were actually looking for suggestions or not, but oh well.