You should always be teasing your girl(s).
It shows you DGAF and her silly protests are like a childs (Amused Mastery)
-Flush the toilet when she's in the shower
-Snap a wet towel at her butt (just barely cross the pain line)
-Turn the light off on her when you leave the room 1/

-Slip her car into neutral when she's driving
-Dutch oven, car oven, shower oven
-Walk around the house with your dick hanging out of your pants-call her a perv for noticing
-"Happy Valentines Day!" (give her a wrapped box of condoms)
-Never give a straight answer 2/

-Turn her shirts inside out
-Put her panties on her cat
-Lock her out of the car-make her chase you on foot
You get the idea. All of these are funny/stupid shit-and it keeps her guessing about what you're going to do.
That's good for girls and you.