What could this be?

Ok so the last couple of times my fiance and i had sex he says that my vagina feels fluffy. Im not sure if this is a good thing or bad thing or what it could be, he's not complaining about it he just says its a different feeling and it feels good. When i googled it people were talking about their partner feeling a mound and that they could be pregnant but my fiance said he doesnt feel a mound. Im not on birth control and im not in any pain. Has anyone else experienced this? Does anyone know what this could be?