I am regularly using dual electric breast pumps to make my boobs larger. I'm currently up to a 36 DD cup, with significant nipples.

I wear a bra in bed to prevent nipple chafe, and this morning, my left bra cup was significantly damp.

Squeezing the breast produced nothing, as did 30 minutes on the breast pump.

 I have been trying to increase the size of my breasts through pumping, but this is a bit of a shock!       

@valerie anne
If you are trying to lactate, then you may be getting what you wish for.

On the other hand, when I read about breast pumping, particularly for MTF breast
enlargement, please be very careful with excessive pump suction, you could draw blood and
cause injury to your nipples and breasts.

HUGS, Danielle