There are 2 ways of prompting the model. You can use tags or write a more humanlike description. From what I tested the description gives better results, however using only tags also works. Examples:
breast massage, a photo of a beautifull woman, pov, breast grab, medium breasts, nude, lying, on back, shiny skin, looking at viewer <lora:breastmassagev1_FLUX:1>
or
A photo from man's pov massaging woman's breasts by grabbing them with both hands. The woman in her early 20s is lying on her back on the ground completely filled with colorful flowers. She is looking straight at the camera with her wide open eyes. Her face has extremely detailed skin texture. Her skin is oiled which gives it a shining effect. She has large breasts, ginger hair and medium length hair. <lora:breastmassagev1_FLUX:0.7>
Unfortunately this model affects faces but lowering the lora's weight helps.
Recommended Lora weight: around 0.5-1.0
Prompts: breast massage, 1girl, 1boy, pov, breast grab, grabbing, large breasts, medium breasts, small breasts, nude, lying, on back, shiny skin, looking at viewer