"You can use my finger"

I am carrying Joey through the airport and I say, "I really need to blow my nose".

"You can use my finger" my sweet boy says, thinking he can really help me out.

I thought he was offering his finger, but I didn't realize that he was also offering his services until he shoved that finger up my nose while I had no free hand to defend myself.  

What a sight we were, me holding my luggage in one hand, my son in the other arm and trying to pull my face from a very determined nose-picker!