Yeah, I had a girl do this to me once, at first it's just like, this is a waste of time, but eventually you just get lost in the feeling, your most sensitive spot being gently teased, the only things that exist after awhile is her finger and the throbbing head of your cock. And then, finally, finally, you just can't take it anymore and EXPLODE. I couldn't even tell you how long it took, I was almost in a trance, definitely the most intense orgasm I've had