Cuan yelped a bit as he started to slide towards Kouta's throat, then calmed himself. There was no point in struggling, especially since he'd came in willingly - even if that choice hadn't been much of a choice. The warm flesh surrounding him kinda felt good too, in a weird sort of way. Eventually Cuan felt his muzzle start to push out into Kouta's stomach and gulped nervously, hoping it wouldn't be full of acid.