You are now my all-time Iopbro.
Seriously though, a bimbo transformation by way of turning into an iop is just killer. Two great tastes that taste great together. And it's pretty well written to boot. Hope you keep up the good work!
The only nitpick I noticed on my first read was the misuse of 'buxom'. The area is the 'bosom', and 'buxom' is what it is when it's Yanaline's size.