有暧昧

there's something going on

(1) go on可以表示“发生，进行”

(2) there's something going on between sb.“某人之间有暧昧”

例

There's something going on between Heather and Wesley.

海瑟和韦斯利之间有暧昧。

I think that there's something going on with her and a boy.

我觉得她和某个男孩有暧昧。《摩登家庭》

有火花

there is chemistry between sb.

(1) chemistry基本义“化学”，引申义“（两人之间）相互吸引”

(2) there is chemistry between sb. “某人之间相互吸引，某人之间来电，某人之间有火花，某人之间有暧昧”

例

I think there's a very real chemistry between them.

我觉得他们俩很暧昧。

Well, we do have chemistry.

好吧，我们俩之间确实有火花。

暧昧短信

flirty messages

(1) flirt “调情”

(2) flirty “调情的，暧昧的”

(3) flirty messages “暧昧信息”

例

Last week, I picked up her cellphone thinking it was mine. And I accidentally read a few flirty text messages.

上周，我错拿了她的手机，无意中看到几条暧昧短信。

A boy sends you flirty texts. Doesn't mean that you have to text him back.

男生给你发暧昧短信，并不表示你要回复他。

调情

flirt with sb.

(1) flirt “调情，打情骂俏”

(2) flirt with sb. “与某人调情，与某人打情骂俏”

例

A: You flirted with Sherlock Holmes?

你跟夏洛克•福尔摩斯调情？

B: At him. He never replied.

单方面，他从来没回过。

He's totally flirting with you too.

他也在跟你打情骂俏。