People being able to feel the moment of conception in some way. Works with sex scenes or otherwise-SFW images.

For some models+styles, "sensing fertilization" should be the only directly impreg-related prompt you actually need.

Testing notes:

• Visual styles that don't show little cartoon visual language tells (like motion lines or the little "flash" of realization) will get less out of model, though you can turn up the weight.

• Illustrious model works alot smoother! If you have issues with multiple fertilization inserts, try the Illust ALT version and change the main trigger phrase to "sens_fert"

• Pony v1 has a lighter touch, start at weight 1 and try boosting to 1.5 or 2 if necessary.

• v2 is stronger, 0.7 is sufficient for many models and may be excessive (e.g. causing multiple sperm-meets-egg inserts) for anime-focused visuals.