Teasing

So my other half (my son's father) likes to tease him. Calls him Patunia and other such things.  For which I constantly tell him "Your his father not his BULLY.'
Well lately he keeps doing the 'I see London, I see France, I see someone's underpants'. And calling my sons underwear girl underwear...
So I had just gone out and bought my son pants, shirts, socks & underwear. At the same time I bought a package of underwear for myself. They were all in the same bag and my other hald was handing my son things to put away in his room. He pulled out my underwear, not realizing it was  mine, and handed it to my son and said "Go put away your girly underwear."
My son "They're Mommies!"
"My other half said "Well how am I supposed to know? They were in with your stuff."

"I'm not the one who wears girls underwear. YOU ARE! You're the one one who's always going up their butt crack!" My son blurted out...
I started laughing. I kept telling my other half that if he kept teasing him he was going to get even someday. Sure enough, he had and didn't even know it till I started laughing.
I simply said 'You better keep your underwear out of your ass crack. He makes it out like your wearing a woman's thong!" To which I started laughing again.