The whole purpose of forums like this are to discuss things out in the open, not in private, so here goes:
I've only titty fucked one woman, and she has read D-cup breasts. A few women I've been with had implants, but they were C and D cupped size. The biggest breasts I've experienced sexually were an all-natural F or G cup, but she was more interested in having my dick inside her pussy that between her tits 9as was I!)
I did see a stripper in NYC long ago that had the kind of fake boobs you like, similar to Morgan Leigh (but not her)
I went to get a polaroid with her after her show, and she had me stand behind her, giving her a hug from the back, my arms around her waist. She grabbed my hands and put them right on her humongous tits, holding them up in place for the picture. Well, the camera needed a new film pack, so I went to drop my hands, and she said "No! You're giving me some needed support!" So we chatted and laughed while I held up her two volleyball sized melons while we waited for the photographer to take the pic. It was fun, but I never sought out women with obvious fake boobs in the real world.