hahaha growing a vagina....
Yes there are two insertions (for pec minor, pec major) but starting with incline presses won't actually stimulate growth there too much more than a flat press. Hell, even if you do mill presses with a slight angle back on the bench your chest contracts.
Just jab an epipen into pec minor then hit your incline presses....
Figjam, doth thou even hoist?
lol kidding, but if you're really trying to gain size as you say, then yes, you will have deposited fat in your lower chest which gives you that sagging/bitch tits look. If you were to cut back some bodyfat your chest would probably look more like you want it to.