我手中有笔便拥有你
[wŏ shŏu zhōng yŏu bĭ biàn yōng yŏu nĭ]
It implies the idea that when one holds a pen (as in writing or painting), they have creative power which could depict, imagine, or even symbolically 'possess' someone or something in a metaphorical sense. It’s romantic and artistic, suggesting the person might be a creator or storyteller of sorts.