What is the ruling on becoming excessively attached to a houri from Paradise and naming her a specific name in the hope of seeing her?

Thinking about Paradise and its delights sharpens one's resolve, and there is no harm in it. However, a Muslim should not indulge in unproductive imaginings that waste time, such as imagining a fictional houri that does not exist by that name. A Muslim should utilize their time for what benefits them, and be preoccupied with the remembrance of Allah, His love, and pondering His verses, for that will suffice them from such imaginings.