Deep Spot stimulating

I love stimulating girl's deep spot and find that they give much stronger orgasm compared to Gspot (some girls I fuck doesn't feel anything from massaging Gspot at all, but none say no to deep spot)

However, with some girls I feel that my fingers are a bit short to reach that spot to massage it comfortably (in a "come hither" motion or 2 fingers Japanese kind). Haven't found any way to overcome this.

Does anyone have the same problem? any suggestion?