Does he like me or is he just teasing me

[Darius]

Yes he knows I'm gay, when I asked him he was coy about it but said he was "open to anything".

I thought the British were supposed to be reserved.

Being new to this country and it's customs, I'm not sure what to make of him.

He's really good-looking and that scares me.

Considering this new info, he wants to tickle more than your armpits. Next time, tell him when you have an erection, encourage him to touch it, maybe even take it out and prove it.
Then reach between his legs and I think you will find he's hard, too.