You decide to try something new with the device, you use it to merge with Olivia and see what happens. When you go to start the process you are prompted to select whose life is dominant;
You want Olivia to mostly stay herself so you make her dominant.
As the merge happens you feel many of the minor aches and pains you felt before go away as you once again become young, still your back is sore from your massive breasts. You original life becomes even hazier, all you can clearly remember is from Olivia's perspective as your girlfriend. You where head over heals for her massive tits the first moment you met her.
Wait these massive melons are the result of you merging with her... Was she not your girlfriend before ?