In my fantasies, ladies generally tend to either be at least a little exhibitionist in nature, or they develop into it by the end. I'm perfectly fine with a busty hotty teasing me with her giant tits, or even just showing them to me (with bonus pic/vid sessions included for a sort of "keepsake"), and the most contact I'd need is to give them a good, thorough groping/massage or be on the receiving end of a good, sack-draining titfuck.
One fantasy is to have a housemate with a similar taste for big boobs as me. In fact, she's trying to see just how big she can get hers to grow, and she'd be more than happy to have some assistance; helping pick out food, daily massages and rubdowns/nipple tweaking and sucking, anything and everything to encourage growth and keep them healthy. In return, she's more than happy to show them off and let me have extra fun with them when the mood strikes. Eventually, she gets so big that she starts to burst out of every top she owns, if not tear them to bits. Eventually, she's left to walk around the place topless 24/7, because she has no more tops or bras that fit, and she can't exactly go out in public like that, can she? So of course, I'll have to find something that can contain them, but not without a near constant bombardment of pics and videos of them (as if actually finding shirts big enough wasn't enough of a problem, now I have to try not to explode in my pants in public because my roommate keeps showing off her massive tits for seemingly no other reason than just to tease).