I would definitely agree with the 3some idea... as well as the cuckolding idea... to sit there want watch the monster cock fill her in ways you never could... of course you would be a nice little boy and clean her up good before getting his sloppy seconds....
As for the 34DDD bra... love that idea... even better would be to invest in some sexy panties that are a few sizes smaller than your g/f and leave those around. Women HATE finding out there's another, smaller, woman. :-D