When your girlfriend/boyfriend gives you a handjob (or fingers you in a girls case) for a few seconds, and proceeds to cease immediatley and cuddle into your arms as if you taunt you unknowingly.
Also, the little kiss on the end of your dick as she puts it away can be lumped into this category.
*girl proceeds to give several good jerks just as you get hard*
"Mmmmm, that feels great baby."
*pulls out her hand, zips your jeans up*
"Awwww, come on! Not another tease-job!"
"Sorry honey, can I have a back rub?"