Just mixing PM powder in lotion is a waste of PM.
I'm a big believer in topical use of herbs for breast enlargement.   I make infused oils with all my herbs.  My latest creation is PM / White Peony infused oil.  I use it 2x a day on my chest, butt, hips, and inner thighs.  I make sure the nipples are dripping with it leave it soak in 30m before showering.  I'm on week number 4 and my nipples are really coming alive.  My skin on my chest is getting very clear and soft.
Fennel and Fenugreek are also well absorbed when infused in oil.  I apply these once ever other day,  and seem to provide an additive effect.
https://lovelygreens.com/herb-infused-oil-for-skincare-salves/