Nah, when Yarizo's dick is way smaller it's just that Techno recycled the CG and put Yarizo in it, that's why his dick varies this much, sometimes the CG was just not for him in the first place.Just accept that size in this game is not consistent, you'll see priestess with a B-Cup on one scene, and H-cup in another.
Same applies to dicks lol, i don't really care tbh but for hentai games big is always better amirite
When you see a CG where Yarizo has his 'normal' horse sized cock, it's just that the CG was made for him.