To ensure anatomy better load a general NSFW Lora in there too at low strength.
Created a few images with a slider for a biggus dickus and thought... lets make a lora out of this, also for edits.

use a horizontal image format, cause a big dick need space XD

Prompts: girl in the image is performing oral sex and deepthroats a black penis of a man. upper body of the dark skinned male is out of frame.

you can also use giant/gigantic/large penis

Strength: 0.5-1.0 (the jaw gets more broken with higher strength)