Will Allah answer a woman's request that her husband in Paradise be hers alone, and that the houri not share him with her?

There is no place in Paradise for this supplication, for in Paradise women do not feel jealousy towards the wide-eyed houris, nor is there malice or rancor. Allah Almighty says: "And We will remove whatever is in their breasts of resentment, [so they will be] brothers, facing each other on thrones." Therefore, one should ask Allah for Paradise and abandon such thoughts.