You take the pen

You watched him toss the pen into your front yard before he started walking away, still groping his new breasts giggling. All you thought was "what the heck just happened!?". You lept from your chair and raced downstream and out the door, grabbing the pen.

"what is this thing.." You spoke to yourself.

You were curious to try it out, but didn't even know why. You thought of who would be good to test the weird pen on to see what it did.