Phase 1:
She has grown so much in her boobs that she is reluctant to move.
So she asked her brother to massage her tits, and it started to feel better and better.
Phase 2:
She's still so excited that she's looking at me like she wants me to keep massaging her.
Phase 3:
She can't move under the weight of her boobs, so she wants me to fetch things for her instead.