CactiGuide.com

well this is a cactus that came with the house we bought its responding very well to watering flowering like crazy but no eatables seem to be growing is there anything i can do top make that happen? i want some fruit!! lol (daiv said it was a c-peruvians so i believe it produces eatable fruit...But you guys tell me.

I have been able to get mine to set fruit by crossing pollen between two different cereus species.
But they will also set fruit by themselves sometimes, presumably bees crossing pollen between the multiple open flowers on the same plant, try crossing the flowers, if they are still open that is.
A few of mine bloomed last night but the flowers are closed and probably fried to a crisp already at 2:00pm.

Hand pollinate the open blooms at night when they are open.Use a soft brush or a cotton bud.