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She's been traveling with The Doctor for so long that Martha forgot what's like to actually have someone paying attention to her.
Chantho is a different kind of doctor, not the one Martha wants to be and certainly not the one The Doctor is, but when they talk Martha feels like she gets her language. She lets Martha chatter on and on about her career not taking her eyes off her for even a second. The last of her kind is really interested in what the future doctor has to say. She thinks Martha is fascinating. She thinks she's probably the most incredible human she has ever met.
Chantho giggles, and blushes, and laughs at Martha jokes even if she doesn't quite understand them. And after such a long time, Martha feels important again. Chantho makes Martha feel seen, and adored, she definitely wants to keep feeling like this. So Martha flirts with her and Chantho feels seen too.
They share a kiss and it stops time. Martha almost doesn't pull away. "Chan, wow, tho." Chantho is so lovely, Martha kisses her again, and again, and again.