This is a concept of missionary sexual position.

i2v trigger words are:

lyingbouncing

In fact, it is OK without the trigger words.

t2v Example of prompt：

This is a highly detailed video depicting a nude, voluptuous woman with large breasts and fair skin lying on a bed with white sheets. her legs spread, showing her vulva. A muscular man is fucking her.They are having intercourse in the missionary position, and this woman's breasts are bouncing. The lighting is soft, highlighting their wet, glistening skin, suggesting recent activity. The video is highly detailed and sexual in nature.