I don't know if this is the right place to ask this but here we go:

I am 24. I recently moved in with an unmarried couple, in their 30's. I rented their room and will be living at their place for 6 months. The guy is 29 and the woman is 37. They are cool people and very easy going.

It's always been my greatest fantasy to have threesome with a couple or with a woman when the husband or boyfriend is watching. I've seen many couples doing that but never had a chance to explore it myself.

Maybe it's a fantasy I am making up in my head, but I get the feeling that this couple has some intentions to do that. I got some signs that they are testing the waters with me but I cannot be very sure:

- When I am visiting their apartment for the first time, the guy asks me how old I am and when I tell them my age, he says "That's a good age for you, huh? Does that work?" and winks at her. She smiles in return.
- We are having a welcome dinner one night and I ask them how long they have been together. The girlfriend says they have known each other for seven years but she is bored of him and wants a younger guy. He says he will go for an older woman soon. They both add they love changing partners and trying new people. They say these in a teasing way but also sound very serious at the same time. I smile innocently and say "Oh, I am having new SPAM soon!" and they both laugh at it.
- They are very open about sex terms. I've heard them making jokes next to me, involving the words "ass, balls, penis, lesbian, gay".

It's only been a week and I am not sure if I should bring my hopes up or not. I am ok with just enjoying them as my SPAM and leaving the place happily but at the same time, I wouldn't want to miss an opportunity to spend some exciting evenings with them during these 6 months if they are up for it.

As you might guess, I am afraid of bringing it up, risking losing my only accomodation here and screwing up with their relationship.

I can understand that this could sound weird and unusual for some people here but I would like some advice on how to handle this situation without looking like a pervert who is after banging a guy's girlfriend. Please do not bother replying if you are gonna give me ethics lessons about how wrong it is to have an eye on a taken woman. I won't do that unless they want it to happen.

I say go with the flow and don't stress that much. If it is going to happen it will happen, and it needs to happen somehow natural not rushed or by some awkward moment.
From what you say they seem to be on the same idea as you, you just need some time to get to know them better and for them to get to know you.
Talk about sex like is a natural thing, tell them what you like but in general without implying that you are after her gf ... etc

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With great power comes great responsibility.

I'm not an expert but they seem like swingers from the second point your mention, I only say this cause curiosity got the best of me and decided to do research but they seem like a mature couple, so they might be a little comfy with sex terms so don't worry just handle it relax and go with the flow your fantasy might come true

I can't say I've been in a situation just like this, but I do know a swinger couple who was good friends with my ex. Everytime anything came up about their sex lives, we were all drunk as hell. My plan if I were you would be to get them trashed and ask specific questions about it. Like who they've done it with in the past and how they knew them. If they say they have ever done it with a roommate I would ask right then and there haha

If they are pretty open about it in front of you, I doubt they would act offended if you ask to join. Especially if you're wasted. Just blame the alcohol for making you horny. Worse case scenario you just act like you don't remember asking