Breasts come in a lot of sizes but I personally love breasts the most when they are big enough to sink my hands in ( I have big hands ). So big breasts are my favorite but I am not a fan of the retarded huge ones.
Don't get me wrong though, I love breasts of all sizes and they all get a special place in my heart but the ones that are for example the size Rias Gremory from highschool DxD has are my favorite.
I am a girl too, blessed with D-cup. And I like seeing girls with big breasts as well (C, D, E..) in RL or in 2D. I am bi and sometimes I would also like to squise them when seeing but it would be sexual harasment :< I also cosplay and do a lot of costumes which look like a corset which presents breasts the best. I am very amused seeing people at conventions, who doesn´t look in my face but at my boobies