Not to repeat suggestions but...

Look at someone you love / think about them... ( My personal way of cumming while messing with myself.. )

Try to relax and not worry about the cumming, just enjoy the
feeling.

Force yourself to keep going as long as you can..

Or maybe imagine that you are humping something in your head while you pleasure yourself... That may work...

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Wow... Funny isn't it? How you think Love has finally found you..... But at a whim it withers and blows away...