LoRA for characters having both their nipples sucked by the same person or entity, because apparently that's rare enough on Danbooru to not be something Illustrious models know.

IL_v1:

Main trigger: sucking both nipples, breasts together,

Optional: sucking own breasts,

Known issues: if the prompt doesn't include any mouth related tags the LoRA can make her suck her own breasts unprompted, sometime adding extra nipples to make that happen.