Is it normal ? fantasising about a "helping hand"

There's a guy I met some time last year who I had a HUGE crush on (and maybe still do)... but I won't say any more unless you really want to know.

In the fantasy, I'm masturbating in my room, but really struggling to orgasm. He walks in, sees me having trouble and asks if I need a hand.
I say yes and we end up having amazing sex where both of us climax really hard.